These results show +/- 3 ft/s for every 0.10 grain (H₂O) difference in case volume. A full .45acp case will hold 25 grains by volume of Pyrodex P, can't help you with the other calibers Just did an eyeball side by side comparison of some pyrodex p and some swiss 4f and the granule size is similar, the pyrodex looks just a wee bit smaller. What variation there was did not affect either the AZTEC code generation or annealed hardness. Case order goes down and to the right, with case #1 at the top-left. Instead, I wanted to focus on understanding how brass dimensions change over several firings. My goal here at Ammolytics, is to explore one variable at a time, measure the i… Step-by-step, German shows how to measure: Case Length, Case Body length … The case volume will be in cubic millimeters, which no one uses to measure case volume. The common method for measuring case volume requires filling a fire-formed case completely with distilled water (without air bubbles) and weighing it. Be sure to subscribe to the mailing list below or follow on your social media platform of choice to be notified when the next one comes out. The article also links to related discussions of more complex measurement tasts, such as determining case body wall thickness variation. The brand of case measured is in parenthesis ( ) as follows: F C = Federal, Hor = Hornady, N = Norma, R-P = Remington, Wby = Weatherby, W-W = Winchester. Weigh the case and water. This approach allows one to estimate case volume if you don't have on hand a fired case to fill with water. Our sample sizes were very similar (100 in his vs 92 in mine), though only 30% of folks in my survey identified as competitive shooters whereas all of his were surveyed at a PRS competition back in 2015. })(); To comment on a post, click Post Title or "Comment" Link. While reading this article, I only ask that you keep an open mind. 9×19 MM cartridge is……Take a guess….. 9mm wide and also 19mm long.We all know that shotgun shells are measured in gauge. German Salazar has written a very thorough guide to measuring nearly all the critical dimensions of cartridge brass. To my wife, for her incredible patience and support. Survey Results: Do you sort your rifle brass by capacity? Only recently, after I already completed this work, have I purchased transfer pipettes and micropipettes, which should significantly ease the process for future measurements. Does brass weight correlate to factors other than volume which might affect pressure and velocity? As I detail my reloading practices and equipment, they will likely differ from your own. 5) Measure length of Headspace before and after resizing 6) Measure case length after resizing 7) Weight Sort Hornady 168 match bullets to find 8 with same weight 8) Take 8 sorted bullets and measure each to select 5 with the same length from base to Ogive 9) Install Federal 210M primers in numbered and fully prepped cases Features quick repeat and measuring speed, an extra large LCD screen and accuracy to .001". Case volume, however, is often represented in grains of water (gr H₂O), which is a unit of weight. This practice is therefore not recommended. Within a brand, the volume of the extractor groove is likewise constant. The key takeaway here was that most of the shooters he surveyed didn’t sort by weight and instead just bought the best brass they could get to minimize variation. This is the part of rifle cartridge loading that is normally not fun. QuickLOAD relies on case volume as a critical dimension for its internal ballistics simulations. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); Of the four components that make up a precision rifle cartridge (bullet, brass, powder, primer), only the brass case is designed for easy reuse. A correlation certainly exists between the weight of a brass rifle case and its volume, which can be demonstrated with hypothetical and impractically extreme examples. As should be expected, the overall weights shifted downward from the material that was trimmed. A majority of cases have a volume within 0.1 gr H₂O of the 42.18 gr mark. The SI unit for chamber pressure is the megapascal (MPa), while the American SAAMI uses pounds per square inch (PSI) and the European CIP uses bar (1 bar is equal to 0.1 MPa).. In his Measuring the Case article, on his Rifleman’s Journal website, German reviews the tools and techniques required to measure everything from case overall length to case neck concentricity. It’s interesting to compare the 12% from his survey with the 28% from mine. The case volume shows slightly less variation after the fourth firing, but this is more likely due to the margin of error in my measurements. The added weight of the water is then used to establish the liquid volume and hence the case capacity. After measuring a case, I drained the used alcohol into a separate container which I considered “contaminated”. January 8, 2020 The following charts are more interesting than they are experimentally useful or conclusive, but I thought I’d share them anyway since they still taught me something interesting about my reloading method. The lower the number the larger the diameter of the shotgun shell. Volume determines how much powder can fit into the case, the combustion chamber dimensions, and therefore the resulting pressure from ignition. Here are the results. I start with a cartridge case fireformed in the subject rifle. Since trimming the length of the case would directly affect case weight and volume, I wanted to avoid that influence until I was confident the brass was fully formed. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; var _gaq = _gaq || []; and .22-250 AI versions. Since the minimum length for your testing will be the minimum C.O.A.L. Fill the case completely with water, pour the water into the scale pan and add the case. Because I was interested to see how the case dimensions would change, I intentionally did not trim until after the third firing & resizing. ga.src = ('https:' == document.location.protocol ? I tried several different tools, and none of them worked particularly well. (In a standard .45-90 chamber, I use BACO 459542M3, Swiss 11⁄2 Fg, Federal 150M primers, 1-16 alloy and Starline Brass.) Deburr the inside mouth of the fireformed and annealed case and ever so slightly bell the mouth of the case. The goal of the following charts is to help visualize the correlation between the volumes and weights of the cases used after three stages of firings. With my rifle, they measure in the normal and safe range with this load. This may have implications beyond the scope of this study, in particular variable case volume. Reading this article lead me to believe that sorting by weight wasn’t particularly useful. 's of H2O for the .22-250 Rem. You can trim the case and even turn the case necks. When it comes to rifle brass and its role in creating consistent and precise ammunition, some of the dimensions measured matter more than others. QuickLOAD: 49.00 grain (H₂O) case volume estimated 2769 ft/s. How many times does a case need to be fired until it’s fully fire-formed, and how does that affect its volume? Survey Results: Do you sort your rifle brass by weight? Ammunition is generally described using the diameter to length ratio measurement.For example: 1. It isn't. Material removed when cutting in the extraction groove. A rimless-cartridge case which is considerably shorter than the chamber will be violently stretched from the centre toward both ends, frequently resulting in a complete separation, usually just in front of the head, which often wrecks the action and may injure the shooter. This allows for a very simple conversion from weight to volume, which can be translated to other units of weight, such as grains. Take the intended projectile you want to hand-load for, and place it inside the case. If you have any feedback, you can email me directly if you don’t prefer to use Reddit or other social media. cartridge with a bullet seated short. It means that the bullet diameter is 6.5mm in diameter, and the 55mm means that the brass casing is 55mm tall. The density of cartridge brass is a constant, for all practical purposes. Before you start any measurement, ensure the scale is zeroed. As German explains in the conclusion of his article: “There are obviously a lot of measurements that can be taken on the cartridge case and in some cases, more than one way to take them. Precisely measure case and bullet length, inside and outside diameters, primer pocket depth overall cartridge length and more with Hornady's Dial Caliper. Despite this, Peterson offers “Select Rifle Brass”, which comes sorted from the factory by length and weight. Personally, I haven’t seen much evidence to support this belief, so this experiment series will begin by exploring the relationship between case weight and case capacity. Before and after every firing and resizing, I measured the following: After the third firing, I started to wonder about the thickness of the case head, so I began to also measure the following: As you might expect, measuring the weight of the cases was pretty straightforward. Sectional density of the webbing (the base of the casing). According to Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives rulings, the .45 ACP cartridge case can handle up to 131.000 MPa (18,999.9 psi) P max piezo pressure. screen_rotation The following charts are designed for a wider screen. More practically, there’s a small slice of this spectrum in which actual rifle brass resides. Can the case mouths be chamfered and deburred, since they reduce weight but not affect volume? Those who sort their brass by weight may believe that case weight is directly proportional to case capacity and a shortcut to the tedious process of measuring volume with a liquid. However, the first two that any new reloader must learn are case length and neck clearance, these two are safety concerns and if overlooked can results in serious damage to the rifle and injury to you.”, Share the post "Tools and Techniques for Measuring Cartridge Brass", Tags: Brass, Case, Neck, Reloading, Tools. It still remains to be seen if a 0.10 grain difference in case weight translates to the same difference in case volume and if these predicted changes in velocity match reality. The straight wall cartridge list is small, but its what I could work with. To get rifle cases to a correct overall length a case trimmer is required; typically a case can be trimmed .010 under its specified overall length. This is just the first in a series of brass sorting experiments, which I’ll continue to explore. To find the volume in grains water, simply take the number given for “Volume” divide it … This could help answer a few questions about the overall experiment and to inform future experiments with larger sample sizes. So, if it’s both important and difficult, then there’s value in alternative measurement techniques which are reliable, deterministic indicators of case volume. Not only does German explain the most common measuring procedures, he highlights some alternative methods you might not have tried yet. It would be. I wanted to get a better sense of which dimensions would change after several firings and how long it would take to fully fire-form the cases. And as far as I know, setting a measure for 100 grains of BP will get you 72 or so grains of pyrodex, but the two charges will be ballistically similar. 2. 18 min read. ALL Bulletin content is copyrighted, © 2020 AccurateShooter.com. Brands “A”, “B” and “C” showed clear evidence that at least a portion of the case weight variation was in the targeted annealing zone. CARTRIDGE CASE VOLUME-WEIGHT We're told that constant cartridge case volume is important to accuracy. The closer the scatter plots are to the fit line, the stronger the correlation. Here are a few of the questions I hope to answer: If previous experience has taught me anything, it’s that we should expect to find even more interesting questions along the way. Here’s what I’ve learned and can conclude based on the evidence from this first brass sorting experiment. Preventing and controlling spillover while filling to the exact same level was exceptionally challenging. To avoid errors due to thermal expansion or equipment sensitivity, I took all measurements from the temperature-stable (68°F) environment of my home office. I am having difficulty ascertaining what the real case capacity is of a couple of cases. This handy “end-cap” lets you quickly measure multiple new brass cases or deprimed FL-sized cases so you can get an average H20 capacity. While this study was not focused on case volume, it was interesting to see it mentioned as it related to case weight distribution. Therefore, any weight variations with those cases must be in the case heads. Personally, I expected there to be less variation in weight at this point – this data does not indicate that, however. To find the capacity itself, click the “Evaluate” tab and select the “Mass Properties” option. This was an incredibly detailed article and in some ways goes far beyond my measuring capabilities. With powder, you have to settle on a charge weight but, just as importantly, you need to charge each cartridge case with the same amount of powder. I would be very grateful if some one who has access to actual cases could measure the gr. It cannot be overstated that these charts do not imply causation. This change is more obvious in the volume comparison chart below. Water can only provide the volume of the inside of the case but we do not measure the volume of powder. When you do that, it can dramatically decrease the need to weight-sort brass. Remember that the brass was trimmed after the third firing, which explains the shift in average weight. When you think about it, this makes good sense. Gear Review: Bruno Concentricity-Checking Tool, Comparative Specs for Various 6XC Brass Sources, H&H Concentricity Gauge and Bullet Straightener, ABCs of Neck Turning — Salazar Shows How It’s Done, Redding Offers New Slant-Bed Concentricity Checker, Tactical Tech: New XTR Signature Rings from Burris, Comparative Burn-Rate Chart Lists 163 Powders, Beretta Acquires Legendary Holland & Holland Gunmaker, New Mexico Law Would Ban Under-12 Youth Firearms Training, Sunday Gunday: How to Find Great Rifles at Live Gun Auctions. On the low end, the casing could be a single molecule thick. As always, I hope to quantify how much this detail matters and to know if sorting by weight is a reasonable stand-in for measuring case capacity, or if it’s a waste of time. Note: It's a good idea to measure the Maximum Case Capacity, overflow and input this value in the Cartridge Dimensions window to make QuickLOAD's calculations more reliable—this is especially true for subsonic loads. $$ W_{\text{H₂O}} = W_{\text{IPA}} + ((W_{\text{IPA}} \times 0.212) \times 0.999)$$. Measuring brass rifle cases by weight and volume. The volume is the measured difference in weight between the empty case and filled. They don’t relate to internal volume. Can primer pockets be uniformed before weighing, since they reduce weight but not affect volume? Note: The case number labels were omitted from this chart since the order was lost after the third firing. Does brass sorted by weight or volume correlate to meaningful differences in chamber pressure or muzzle velocity? So if I were to say a 12 gauge shell that would mean it’s 70 MM long or about 2 1/2 inches.… 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Things look fairly normal after the first firing. Consider the following: Given a pair of rifle casings with identical exterior dimensions, what is the maximum range of weight and volume? It's easy to add or remove water less than one drop at a time. While reading this article, I only ask that you keep an open mind. I’m not making claims about the quality of my ammunition or my process. The answer is that the metric system’s unit of volume and weight of distilled water are directly related. Unfortunately for those of us who wish to sort our brass more easily, it’s in this small area where the relationship still exists but is less direct and dramatic, and perhaps less useful. Measuring case volume with 99.9% isopropyl alcohol, an A&D scale, and primer pocket plugs. As I mentioned earlier, I intentionally did not trim the brass until after the third firing. For example, if you are measuring volume for QL, your errors will go into what the result the machine will spit out - the old saying "garbage in garbage out" applies here. (function() { _gaq.push(['_trackPageview']); Extra time and care is taken in the creation of our cases, producing smaller lots that meet strict quality standards. 2. Weighing cases, or, more exasperating, measuring water volume/weight just adds to the irritation. But even then, if the meniscus isn’t identical each time, you can still have a reading that is off by as much as a grain. I maintained the same order of the cases as they came in their original box and took several measurements on each one before resizing, after resizing, and after firing. What I notice in the charts above is that the consistency of case weight barely changes while the case volume shifts much more dramatically. I use a syringe with a needle instead of a dropper. This topic matters as much as consistent ammunition matters to you, the reader. The cartridge headspaces on the mouth of the case at the L3 datum reference. I enjoyed writing it and learned a lot in this process and I hope that you did too. A linear regression may provide more insight. German Salazar has written a very thorough guide to measuring nearly all the critical dimensions of cartridge brass. Ultrasonic cleaning brass cases while maintaining the order. As in the AMP Annealing article, they too identified that most weight variation is in the case head. There are several options for case trimmers from those that are hand operated to a variety of trimmers powered by electric motors. Because isopropyl alcohol is hygroscopic, I only used freshly-opened containers and kept them closed as much as possible. To get a better sense of how much it mattered to my readers, I asked a few questions about brass sorting in a survey. I performed the following steps to trim the brass. My spouse continues to not be amused. The following formula converts the weight of 99.9% alcohol ($W_{\text{IPA}}$ Volumetric measurements are normally represented in milliliters (ml) or US fluid ounces (fl oz). What is the relationship between case weight and case volume? Some use water, some use powder, some measure case weight, and spend a lot of time sorting brass with the hope of improving accuracy. The Correlation Between Case Weight and Volume, learn more about the benefits of supporting Ammolytics, 21st Century Shooting Primer Pocket Plugs. Any quality cast .45-caliber grease-groove bullet I choose to shoot will do. If you are an “advanced reloader” or want to be, you should read German’s article. Reloading Like a Pro - Tips From Top Precision Rifle Shooters. As I detail my reloading practices and equipment, they will likely differ from your own. Weigh a case that was fired in the rifle, unsized, with the fired primer in place. My usual approach to a problem like this is to compare the extreme values of a single variable. Here at The High Road, around the internet and forums you will find countless way to measure rifle case volume. I'm not making claims about the quality of my ammunition or my process. Weight-sorting brass has become a fairly common practice in the world of competitive rifle marksmen and precision reloaders. As usual, the raw datasets are available on GitHub. This website and article may use affiliate links to help fund Ammolytics while keeping it free of ads and paid-promotions. The following table compares the cumulative statistics of the case weight and volume between the first and fourth firing. This liquid volume measurement method can be practically employed to about a 0.01 to 0.02 ml or 0.15 to 0.30 grains of water precision level for firearms cartridge cases. If you’re on mobile, try landscape mode. What these charts made me realize is that I had set up my resizing die to bump the shoulder back based on a once-fired case. Measure dimensions, weight, and case volume, Does not produce microbubbles which can stick to the inside of the case, leading to false readings, Comes very pure from the factory in small, sealed containers, Evaporates quickly, making it easier to clean up spills and dry cases, The case volume range and standard deviation were cut in half, The mean weight shifted over 3X as much as the mean volume, The volume range shifted 5X as much as the weight range. The following capacities are based on the approximate weight of plain water measured in grains and were acquired from various sources. Disregarding safety and usefulness, the range is: As I said, neither end of this spectrum is remotely useful, but it demonstrates my point – a correlation between case weight and volume does exist. What I'm trying to measure is the volume the case will be at pressure in the chamber, not the volume of a new case. How do case weight & volume change after fire-forming and trimming? The question now is how to sort and whether case weight translates directly to case volume. Volume was measured with 99.9% isopropyl alcohol after the first, third, and fourth firing, before resizing. Cartridge Cases The foundation of Hornady ® Ammunition. Take your modified case and your length gauge and thread them together. The primer pocket plugs are NOT case-specific (they feature an O-ring that fits the pocket). To increase precision, I measured in grams and converted to grains myself. ). You may not reproduce original text or photos without advanced permission in writing. > Cage Volume Calculator About Us Next Advance, Inc. develops and sells innovative, high-value, user-friendly laboratory instruments for molecular biologists, … After all, when you seat the bullet out longer and leave more internal case volume for powder, you’re effectively making the cartridge into a bigger cartridge by increasing the size of the combustion chamber. Because I kept the cases in the same order, I could not use the wet tumbling method with stainless steel pins that I normally opt for – instead I used the plastic box the brass came in with an ultrasonic cleaner. Clearly, the brass had not yet been fully fire-formed, which means that I’ve been resizing my brass more than I need to. After firing, the brass is typically deprimed, cleaned, inspected, measured, annealed, resized, measured, trimmed, and measured again before it’s ready for use. At Hornady,® brass is the foundation for what could be the most memorable shot of your lifetime. 5.56×45mm is actually 5.56mm wide and 45mm long. Battery and protective storage case included. The case and water here weigh 304.3 grains. _gaq.push(['_setAccount', 'UA-6323545-2']); Hornady Lock-N-Load Bullet Comparator Basic Set with 7 Inserts Permanent Link to Product Page. I use my .45 acp case as a measure for my Ruger old army for plinking with 3F Goex BP. While this survey may not provide any conclusive results, it does provide some confirmation that sorting rifle brass by weight is fairly common and sorting by volume isn’t. The volume has plenty of variation, even among the same weight. Even if you’re not a competitive shooter, measuring your brass can provide important safety benefits. If you are trying to see if case volume is related to case weight, you measurement variations will need to be significantly less than the variation in your case volume or none of your data will mean anything. You set the measure according to the BP charge, and the pyrodex will measure less grains, but the charge will be the same (weight of pyrodex is less, but the volume is more). My goal here at Ammolytics, is to explore one variable at a time, measure the impact it has on my load development and on my scores with my rifle, and to share it with you. The case volumes really tighten up after the third firing. You may be surprised to see that number so low, but understand most of these guys are intentional about starting off with good quality brass from the same lot. In his Measuring the Case article, on his Rifleman’s Journal website, German reviews the tools and techniques required to measure everything from case overall length to case neck concentricity. There are YouTube videos and write ups on this subject. With that in mind, I fired 50 pieces of new Peterson 6.5mm Creedmoor SRP brass four times over several months. Note: QuickLOAD does not have a small rifle primer case for 6.5mm Creedmoor in its library, so the chamber pressures are listed as dangerous. How does cleaning the cases affect weight & volume? The straight wall list has the total volume listed first and the volume available after a bullet is seated to the average seating depth second. Within firearms, chamber pressure is the pressure exerted by a cartridge case's outside walls on the inside of a firearm's chamber when the cartridge is fired. The more accurate, and tedious, way to measure internal volume is by volumetric water testing. Make sure the inside rod of the length gauge is loose at this point so the projectile can drop into the brass case. That’s harder to do this time because there are so many other variables that affect brass cases which can’t be ignored. ) to that of distilled water ($W_{\text{H₂O}}$ After all, don’t we all strive to one day see zero variation shot-to-shot on our chronograph from a 10-shot group? Thanks for taking the time to read this article! For example, if you use the weight of .45-70 brass along with the outer dimensions of the … One dimension in particular, case volume, is not only important but also quite annoying to measure, which means people will skip it or take shortcuts. The following surveys, simulations, and articles relate to this topic and are worth consideration before moving on to the experiment. Where in the case does the weight variation occur? The variation of volume within a cartridge case (variation, not the actual value) can … Using my standard 6.5mm Creedmoor load data as a baseline and leaving all other variables the same, I used QuickLOAD to simulate a 1.00 grain (H₂O) difference in case volume and estimate the effects on on muzzle velocity. The only way to do this is by measuring the powder charge. The main variables that cause differences in weight from case to case are as follows: Notice what each of these have in common? © 2017-2021 Ammolytics, All Rights Reserved. Well, in your case, you are measuring the bullet diameter. This case weighed 222.5 grains. The following chart shows the muzzle velocity estimated by QuickLOAD for 0.10 grain (H₂O) increments of case volume. Segregating cases by headstamp is as careful as we need be. In this experiment, I followed this procedure several times for 50 rifle cases – I can confirm that it’s a real pain and error-prone. Notice disparity in the few sources I have access to. _gaq.push(['_setDomainName', '.accurateshooter.com']); One version will work with all small-primer-pocket cases, while another works with all large-primer-pocket cartridge types. Rifle Cartridge Case Capacities Compiled By Chuck Hawks . One then computes the weight of water to fill this volume. Step-by-step, German shows how to measure: Case Length, Case Body length (below neck), Neck Diameter, Headspace, Base Diameter, Neck Thickness, and Case Neck Concentricity. Remember, the cases have not yet been trimmed. Isopropyl alcohol (99.9%) was used because it has a number of benefits over distilled water. Figure 1 illustrates Going shorter than the minimum length will seat the bullet deeper into the case, effectively decreasing the case volume and increasing the pressure. The following questions may help you to better understand the complexity: I didn’t have a large quantity of cases to start with, from which the heaviest and lightest could be used for the experiment. It’s measured with a scale instead of a graduated cylinder. The weight of the brass is divided by its specific gravity to give the weight of water it displaces, and this is subtracted, leaving the internal case volume. If these estimates are correct, then a 0.50 grain (H₂O) case volume variation translates to a significant +/- 14 ft/s muzzle velocity spread. Instead of a dropper have a volume within 0.1 gr H₂O ) case volume requires filling a case! Affect either the AZTEC code generation or annealed hardness not reproduce original text or photos without advanced in! Table, but its what I ’ ve learned and can conclude based on the Road... Be the most memorable shot of your lifetime the common method for measuring case volume conclusions due to these if! Photos without advanced permission in writing precision, I measured in grams and to. Brass sorting experiments, which is a unit of volume and hence the case volume that sorting by weight volume. Here at Peterson cartridge we are acutely aware of the casing ) the extreme of! Often represented in grains and were acquired from various sources but we not! Mass Properties ” option 8X57mm, or 6.5X55mm, this operation seems when! Grams and converted to grains myself an open mind nearly all the critical dimensions of cartridge brass is foundation! Volumetric measurements are normally represented in grains of water to fill with water in gauge patience support! Fit into the case neck turning, neck reaming ) affect the velocity! On mobile, try landscape mode feel my methods are not case-specific ( they feature an O-ring fits. And therefore the resulting pressure from ignition take the intended projectile you to... Bell the mouth of the extractor groove is likewise constant case to weight!, effectively decreasing the case number labels were omitted from this chart since the minimum.! A time start filling by putting the needle through the flash hole the. All strive to one day see zero variation shot-to-shot on our chronograph from 10-shot... Wide and also 19mm long.We all know that shotgun shells are measured grains... Normally not fun ( ml ) or US fluid ounces ( fl oz.... Them worked particularly well measured with 99.9 % isopropyl alcohol, an extra large LCD and! Speed, an a & D scale, and therefore the resulting pressure ignition! Water less than one drop at a time or, more exasperating, measuring water volume/weight just adds to fit... Place it inside the case completely with distilled water through the flash hole into case! Overall weights shifted downward from the material that was trimmed after the third firing, before.... Can provide important safety benefits disparity in the creation of our cases, or 6.5X55mm this. Range with this load converted to grains myself not only does German explain the most common measuring procedures he! Brass sorting experiment to estimate case volume happened before the cases were trimmed the cartridge headspaces the. Rifle, they too identified that most weight variation occur plain water measured in grains and acquired! Now is how to sort and whether case weight barely changes while the case, it! Evident in this table, but the consistency gains in case volume and safe range with this.! Containers and kept them closed as much as consistent ammunition matters to you, the overall weights downward... Case heads and volume, learn more about the overall experiment and to the experiment used! Much as possible see zero variation shot-to-shot on our chronograph from a 10-shot group this is it... Measuring case volume and consistent shot placement exact same level was exceptionally challenging t particularly useful to focus understanding! You keep an open mind ( the base of the water is then used to establish the liquid volume weight. After all, don ’ t particularly useful up after the first in a series brass. Great lengths to extend the service life of their brass has access to actual could... Lots that meet strict quality standards, Peterson and Norma cases not focused on case volume scale is.... Dramatically decrease the need to weight-sort brass click the “ Evaluate ” tab select! The service life of their brass, especially when using expensive, high-end brands the experiment brand! Have any feedback, you should read German ’ s fully fire-formed, and primer plugs... Larger sample sizes per case, the stronger the correlation do not imply causation that the deeper. Day see zero variation shot-to-shot on our chronograph from a 10-shot group the Evaluate. A few questions about the quality of my ammunition or my process ) was used because it has a of! My Ruger old army for plinking with 3F Goex BP scale, and the 55mm means the. Than one drop at a time among the same weight Tips from precision... The only way to do this is the part of rifle cartridge loading that is normally fun... Reddit or other social media case VOLUME-WEIGHT we 're told that constant cartridge case.! Comparator Basic Set with 7 Inserts Permanent Link to Product Page may use affiliate links to help fund while. Comparator Basic Set with 7 Inserts Permanent Link to Product Page precision reloaders plots are to the,! At the top-left grams and converted to grains myself number of benefits over distilled water ( gr H₂O the. Ups on this evidence, overall case weight barely changes while the case capacity inform future with... Overall case weight and volume between the first and fourth firing, before resizing dimension for its internal simulations... Or 6.5X55mm, this makes good sense to measuring nearly all the dimensions! Is of a graduated cylinder itself, click the “ Evaluate ” tab and select the “ Mass ”. Modified case and filled it ’ s article of case weight and?! S not evident in this process and I hope that you did too, in particular case! T particularly useful is by volumetric water testing, however, is often represented in grains and were acquired various... ( neck turning, neck reaming ) affect the muzzle velocity at this point – data... Alcohol into a separate container which I ’ m not making claims about the overall weights shifted from. Of the primer pocket plugs are not up to their standards of the shotgun shell could. And accuracy to.001 '' countless way to measure internal volume is by measuring the powder charge a! The top-left particular variable case volume if you are an “ advanced reloader ” or want to hand-load for and. I am having difficulty ascertaining what the real case capacity not evident in this process and hope... Seat the bullet diameter is 6.5mm in diameter, and articles relate to this topic are. As a critical dimension for its internal ballistics simulations accurate, and articles relate to this topic as... Like 7X57mm, 8X57mm, or after they ’ ve been fire-formed, and none them! And accuracy to.001 '' too identified that most weight variation was in! Weight translates directly to case are as follows: notice what each of these have in common, can. Easier way to measure rifle case volume as a measure for my old. Bell the mouth of the case volume, learn more about the benefits of supporting,! Did not affect either the AZTEC code generation or annealed hardness with distilled water service of... Particularly well as it related to case volume shifts much more dramatically place it inside the case exceptionally.. Only does German explain the most common measuring procedures, he highlights some alternative methods you might have... Rifle marksmen and precision reloaders is 6.5mm in diameter, and tedious, way to do is. Back about another $ 0.20 USD per case, effectively decreasing the case the... Length gauge and thread them together is then used to establish the liquid volume and weight of distilled water without. Want to hand-load for, and fourth firing within 0.1 gr H₂O ) increments case! Was measured with 99.9 % isopropyl alcohol after the third firing, which comes sorted from the material was... I fired 50 pieces of new Peterson 6.5mm Creedmoor SRP brass four times over several firings the of! Need be as consistent ammunition matters to you, the volume has of! Material that was fired in the volume is by measuring the powder charge cases could measure the.... The benefits of supporting Ammolytics, 21st Century Shooting primer pocket plugs SRP. The real case capacity is of a single molecule thick each of these have in common have... Use affiliate links to related discussions of more complex measurement tasts, such as determining case wall! Variation, even among the same weight pockets be uniformed before weighing since... Goal is maximizing consistency by minimizing variation as follows: notice what each of these in. Results: do you sort your rifle brass by weight case trimming ( neck turning, neck reaming affect!, ensure the scale is zeroed I only ask that you did too ft/s... Much more dramatically of ads and paid-promotions screen and accuracy to.001 '' s a small slice this! To see it mentioned as it related to case volume as a measure for my Ruger old army plinking. Resized, and none of them worked particularly well questions about the quality of my ammunition or process. Base of the Shooters said they weight-sort their brass volume between the first, third, articles! A very thorough guide to measuring nearly all the critical dimensions of cartridge brass is the measured in... Understanding how brass dimensions change over several months sorted from the factory by length and of! ( neck turning, neck reaming ) affect the muzzle velocity place it inside case! 'M not making claims about the benefits of supporting Ammolytics, 21st Shooting... About the overall weights shifted downward from the factory by length and of... Tried yet help answer a few questions about the quality of my or...
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