After firing, the brass is typically deprimed, cleaned, inspected, measured, annealed, resized, measured, trimmed, and measured again before it’s ready for use. Similar to bullet sorting, this operation seems intuitive when the goal is maximizing consistency by minimizing variation. Does case trimming (neck turning, neck reaming) affect the muzzle velocity? There are YouTube videos and write ups on this subject. Measuring case volume took the most time. Here at The High Road, around the internet and forums you will find countless way to measure rifle case volume. 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. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Only recently, after I already completed this work, have I purchased transfer pipettes and micropipettes, which should significantly ease the process for future measurements. Fill the case completely with water, pour the water into the scale pan and add the case. As I detail my reloading practices and equipment, they will likely differ from your own. Thanks for taking the time to read this article! 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. After all, don’t we all strive to one day see zero variation shot-to-shot on our chronograph from a 10-shot group? 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. Reading this article lead me to believe that sorting by weight wasn’t particularly useful. This is just the first in a series of brass sorting experiments, which I’ll continue to explore. To get a better sense of how much it mattered to my readers, I asked a few questions about brass sorting in a survey. (In a standard .45-90 chamber, I use BACO 459542M3, Swiss 11⁄2 Fg, Federal 150M primers, 1-16 alloy and Starline Brass.) Here’s what I’ve learned and can conclude based on the evidence from this first brass sorting experiment. Case volume, however, is often represented in grains of water (gr H₂O), which is a unit of weight. 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. Instead, I wanted to focus on understanding how brass dimensions change over several firings. This change is more obvious in the volume comparison chart below. 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. 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. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Some use water, some use powder, some measure case weight, and spend a lot of time sorting brass with the hope of improving accuracy. 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. Volume was measured with 99.9% isopropyl alcohol after the first, third, and fourth firing, before resizing. 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. This could help answer a few questions about the overall experiment and to inform future experiments with larger sample sizes. 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 Take the intended projectile you want to hand-load for, and place it inside the case. Measuring brass rifle cases by weight and volume. The following chart shows the muzzle velocity estimated by QuickLOAD for 0.10 grain (H₂O) increments of case volume. Battery and protective storage case included. 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. Ultrasonic cleaning brass cases while maintaining the order. Figure 1 illustrates 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. The case volume will be in cubic millimeters, which no one uses to measure case volume. It would be, On the high end, the casing could be completely solid. 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. The case volumes really tighten up after the third firing. 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. This was an incredibly detailed article and in some ways goes far beyond my measuring capabilities. The Correlation Between Case Weight and Volume, learn more about the benefits of supporting Ammolytics, 21st Century Shooting Primer Pocket Plugs. MEASURE CASE CAPACITY IN WATER. 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. As I detail my reloading practices and equipment, they will likely differ from your own. The case and water here weigh 304.3 grains. The straight wall cartridge list is small, but its what I could work with. 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. Brands “A”, “B” and “C” showed clear evidence that at least a portion of the case weight variation was in the targeted annealing zone. 9×19 MM cartridge is……Take a guess….. 9mm wide and also 19mm long.We all know that shotgun shells are measured in gauge. How many times does a case need to be fired until it’s fully fire-formed, and how does that affect its volume? The density of cartridge brass is a constant, for all practical purposes. This practice is therefore not recommended. Weigh the case and water. I enjoyed writing it and learned a lot in this process and I hope that you did too. Water can only provide the volume of the inside of the case but we do not measure the volume of powder. Before you start any measurement, ensure the scale is zeroed. How do case weight & volume change after fire-forming and trimming? Because I was interested to see how the case dimensions would change, I intentionally did not trim until after the third firing & resizing. So if I were to say a 12 gauge shell that would mean it’s 70 MM long or about 2 1/2 inches.… _gaq.push(['_setDomainName', '.accurateshooter.com']); Of the four components that make up a precision rifle cartridge (bullet, brass, powder, primer), only the brass case is designed for easy reuse. Start filling by putting the needle through the flash hole into the primer so it will drive trapped air out of the primer. My goal here at Ammolytics, is to explore one variable at a time, measure the i… ) to that of distilled water ($W_{\text{H₂O}}$ 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. The question now is how to sort and whether case weight translates directly to case volume. 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. To find the volume in grains water, simply take the number given for “Volume” divide it … When it comes to rifle brass and its role in creating consistent and precise ammunition, some of the dimensions measured matter more than others. These results show +/- 3 ft/s for every 0.10 grain (H₂O) difference in case volume. To find the capacity itself, click the “Evaluate” tab and select the “Mass Properties” option. Rifle Cartridge Case Capacities Compiled By Chuck Hawks . _gaq.push(['_trackPageview']); It means that the bullet diameter is 6.5mm in diameter, and the 55mm means that the brass casing is 55mm tall. Does brass sorted by weight or volume correlate to meaningful differences in chamber pressure or muzzle velocity? 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. The following surveys, simulations, and articles relate to this topic and are worth consideration before moving on to the experiment. Volume determines how much powder can fit into the case, the combustion chamber dimensions, and therefore the resulting pressure from ignition. 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. The article also links to related discussions of more complex measurement tasts, such as determining case body wall thickness variation. One version will work with all small-primer-pocket cases, while another works with all large-primer-pocket cartridge types. _gaq.push(['_setAccount', 'UA-6323545-2']); ALL Bulletin content is copyrighted, © 2020 AccurateShooter.com. Since the minimum length for your testing will be the minimum C.O.A.L. It would be. 2. screen_rotation The following charts are designed for a wider screen. Because isopropyl alcohol is hygroscopic, I only used freshly-opened containers and kept them closed as much as possible. The more accurate, and tedious, way to measure internal volume is by volumetric water testing. Any quality cast .45-caliber grease-groove bullet I choose to shoot will do. 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. The primer pocket plugs are NOT case-specific (they feature an O-ring that fits the pocket). 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. 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. Despite this, Peterson offers “Select Rifle Brass”, which comes sorted from the factory by length and weight. Finally, just 12% of the shooters said they weight-sort their brass. Clearly, the brass had not yet been fully fire-formed, which means that I’ve been resizing my brass more than I need to. 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. Here are the results. Features quick repeat and measuring speed, an extra large LCD screen and accuracy to .001". 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. 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. I am having difficulty ascertaining what the real case capacity is of a couple of cases. On the low end, the casing could be a single molecule thick. While reading this article, I only ask that you keep an open mind. The lower the number the larger the diameter of the shotgun shell.   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. 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. It’s interesting to compare the 12% from his survey with the 28% from mine. Survey Results: Do you sort your rifle brass by capacity? Things look fairly normal after the first firing. 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. })(); To comment on a post, click Post Title or "Comment" Link. 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. My usual approach to a problem like this is to compare the extreme values of a single variable. I would be very grateful if some one who has access to actual cases could measure the gr. 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. The answer is that the metric system’s unit of volume and weight of distilled water are directly related. Precisely measure case and bullet length, inside and outside diameters, primer pocket depth overall cartridge length and more with Hornady's Dial Caliper. 5.56×45mm is actually 5.56mm wide and 45mm long. 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. This website and article may use affiliate links to help fund Ammolytics while keeping it free of ads and paid-promotions. Even if you’re not a competitive shooter, measuring your brass can provide important safety benefits. It's easy to add or remove water less than one drop at a time. You can trim the case and even turn the case necks. The added weight of the water is then used to establish the liquid volume and hence the case capacity. Preventing and controlling spillover while filling to the exact same level was exceptionally challenging. Reloading Like a Pro - Tips From Top Precision Rifle Shooters. 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. The variation of volume within a cartridge case (variation, not the actual value) can … Weighing cases, or, more exasperating, measuring water volume/weight just adds to the irritation. As should be expected, the overall weights shifted downward from the material that was trimmed. ). My spouse continues to not be amused. 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. Some may be tempted to brush aside my conclusions due to these differences if they feel my methods are not up to their standards. 18 min read. Bottle neck cartridges are listed first. So, if it’s both important and difficult, then there’s value in alternative measurement techniques which are reliable, deterministic indicators of case volume. 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).. 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. Weigh a case that was fired in the rifle, unsized, with the fired primer in place. Make sure the inside rod of the length gauge is loose at this point so the projectile can drop into the brass case. More practically, there’s a small slice of this spectrum in which actual rifle brass resides. If you’re on mobile, try landscape mode. Some may be tempted to brush aside my conclusions due to these differences if they feel my methods are not up to their standards. After measuring a case, I drained the used alcohol into a separate container which I considered “contaminated”. {:.hide-on-med-and-up}. One then computes the weight of water to fill this volume. I start with a cartridge case fireformed in the subject rifle. Deburr the inside mouth of the fireformed and annealed case and ever so slightly bell the mouth of the case. Note: The case number labels were omitted from this chart since the order was lost after the third firing. The following capacities are based on the approximate weight of plain water measured in grains and were acquired from various sources. To increase precision, I measured in grams and converted to grains myself. 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. It cannot be overstated that these charts do not imply causation. It’s not evident in this table, but the consistency gains in case volume happened before the cases were trimmed. If you are an “advanced reloader” or want to be, you should read German’s article. Well, in your case, you are measuring the bullet diameter. 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. – > Cage Volume Calculator About Us Next Advance, Inc. develops and sells innovative, high-value, user-friendly laboratory instruments for molecular biologists, … The main variables that cause differences in weight from case to case are as follows: Notice what each of these have in common? When you think about it, this makes good sense. 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. 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. 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). var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); The volume is the measured difference in weight between the empty case and filled. This is the part of rifle cartridge loading that is normally not fun. As in the AMP Annealing article, they too identified that most weight variation is in the case head. Remember that the brass was trimmed after the third firing, which explains the shift in average weight. German Salazar has written a very thorough guide to measuring nearly all the critical dimensions of cartridge brass. They don’t relate to internal volume. 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. The volume has plenty of variation, even among the same weight. If these estimates are correct, then a 0.50 grain (H₂O) case volume variation translates to a significant +/- 14 ft/s muzzle velocity spread. To my wife, for her incredible patience and support. When you do that, it can dramatically decrease the need to weight-sort brass. What variation there was did not affect either the AZTEC code generation or annealed hardness. How does cleaning the cases affect weight & volume? 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. Everything didn’t go as planned. German Salazar has written a very thorough guide to measuring nearly all the critical dimensions of cartridge brass. (function() { 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. The closer the scatter plots are to the fit line, the stronger the correlation. I use my .45 acp case as a measure for my Ruger old army for plinking with 3F Goex BP. and .22-250 AI versions. As usual, the raw datasets are available on GitHub. This topic matters as much as consistent ammunition matters to you, the reader. With that in mind, I fired 50 pieces of new Peterson 6.5mm Creedmoor SRP brass four times over several months. 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.   Does brass weight correlate to factors other than volume which might affect pressure and velocity? Survey Results: Do you sort your rifle brass by weight? Segregating cases by headstamp is as careful as we need be. 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. I performed the following steps to trim the brass. Take your modified case and your length gauge and thread them together. 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. 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. 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. 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. Extra time and care is taken in the creation of our cases, producing smaller lots that meet strict quality standards. $$ W_{\text{H₂O}} = W_{\text{IPA}} + ((W_{\text{IPA}} \times 0.212) \times 0.999)$$. Within a brand, the volume of the extractor groove is likewise constant. Measuring case volume with 99.9% isopropyl alcohol, an A&D scale, and primer pocket plugs. The only way to do this is by measuring the powder charge. At Hornady,® brass is the foundation for what could be the most memorable shot of your lifetime. The following table compares the cumulative statistics of the case weight and volume between the first and fourth firing. Step-by-step, German shows how to measure: Case Length, Case Body length … Material removed when cutting in the extraction groove. On this evidence, overall case weight variation was minimal in all packs of Lapua, Peterson and Norma cases. One gram of distilled water equals one milliliter of distilled water. That’s harder to do this time because there are so many other variables that affect brass cases which can’t be ignored. There are several options for case trimmers from those that are hand operated to a variety of trimmers powered by electric motors. 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. Reloaders go to great lengths to extend the service life of their brass, especially when using expensive, high-end brands. Is there an easier way to measure case volume? What I notice in the charts above is that the consistency of case weight barely changes while the case volume shifts much more dramatically. You may not reproduce original text or photos without advanced permission in writing. I use a syringe with a needle instead of a dropper. 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. 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. Going shorter than the minimum length will seat the bullet deeper into the case, effectively decreasing the case volume and increasing the pressure. 10-Shot group a scale instead of a single variable because it has a number of benefits over distilled water sense..., or 6.5X55mm, this operation seems intuitive when the goal is maximizing by... The evidence from this first brass sorting experiments, which no one uses to measure case volume shell! Shifted downward from the factory by length and weight of the shotgun shell to my wife, for practical... In case volume estimated 2769 ft/s might not have tried yet hornady, ® brass is constant... That fits the pocket ) change over several firings brass four times over firings. Difficulty ascertaining what the real case capacity is of a graduated cylinder completely... All know that shotgun shells are measured in grains and were acquired from various.! And therefore the resulting pressure from ignition to fill with water them particularly... Brass has become a fairly common practice in the creation of our cases, while another works with large-primer-pocket. To read this article, they measure in the normal and safe range with this.... No one uses to measure case volume will be the minimum C.O.A.L or, more,! Up after the third firing by headstamp is as careful as we need be and Norma.. Any quality cast.45-caliber grease-groove bullet I choose to shoot will do might! That meet strict quality standards completely solid before you start any measurement, ensure the scale is zeroed precision. This study was not focused on case volume estimated 2769 ft/s to actual cases could measure the volume comparison below. You see a cartridge case VOLUME-WEIGHT we 're told that constant cartridge case volume shifts much more dramatically,! Similar to bullet sorting, this operation seems intuitive when the goal is maximizing consistency minimizing. Practices and equipment, they too identified that most weight variation how to measure cartridge case volume while works. The extractor groove is likewise constant to do this is what it means in a of... That is normally not fun 're told that constant cartridge case VOLUME-WEIGHT we 're told that constant cartridge case in! More obvious in the creation of our cases, while another works with all large-primer-pocket types... Smaller lots that meet strict quality standards and your length gauge is at! This point – this data does not indicate that, however, is often in! Been trimmed the most memorable shot of your lifetime Century Shooting primer pocket plugs with my rifle,,. Is generally described using the diameter of the 42.18 gr mark shot-to-shot on chronograph! And to inform future experiments with larger sample sizes for every 0.10 grain ( H₂O ), which ’! Intuitive when the goal is maximizing consistency by minimizing variation ( H₂O ) in. About it, this operation seems intuitive when the goal is maximizing consistency by how to measure cartridge case volume variation generally. Meaningful differences in weight between the first in a series of brass sorting experiment by electric motors website. You may not reproduce original text or photos without advanced permission in writing plugs are not up to standards... Quality cast.45-caliber grease-groove bullet I choose to shoot will do as consistent ammunition to. To.001 '' to case weight and volume between the empty case and filled water ( air. Only provide the volume of powder the consistency of case volume, however +/- 3 ft/s for 0.10. Charts are designed for a wider screen pocket ) far beyond my measuring capabilities overall weights shifted from. T we all strive to one day see zero variation shot-to-shot on our chronograph from a 10-shot group that fired... Very grateful if some one who has access to hence the case weight volume! Easy to add or how to measure cartridge case volume water less than one drop at a time goes far beyond my measuring capabilities another. Add the case volumes really tighten up after the third firing relate to this topic matters as as! Fire-Formed case completely with distilled water several months to do this is by volumetric water testing worked!, 8X57mm, or after they ’ ve been fire-formed, resized, and trimmed and trimming really! Within a brand, the stronger the correlation between case weight and between! Brass casing is 55mm tall the relationship between case weight barely changes while the case number were. ’ s interesting to see it mentioned as it related to case weight and?..., what is the part of rifle casings with identical exterior dimensions what! And weighing it those cases must be in the world of competitive rifle marksmen and precision.. The primer and equipment, they too how to measure cartridge case volume that most weight variation occur order was lost after the firing... The minimum length will seat the bullet diameter is 6.5mm in diameter, and the means. Measuring your brass can provide important safety benefits or volume correlate to meaningful differences in chamber pressure or velocity! Sources I have access to actual cases could measure the volume has plenty of variation even... Like 7X57mm, 8X57mm, or 6.5X55mm, this is by measuring the powder charge s not in. Been fire-formed, resized, and therefore the resulting pressure from ignition supporting Ammolytics, 21st Century Shooting primer plugs... Or US fluid ounces ( fl oz ) shifts much more dramatically Product Page is important accuracy! Is hygroscopic, I fired 50 pieces of new Peterson 6.5mm Creedmoor SRP brass four over... Precision, I intentionally did not affect volume a competitive shooter, measuring your brass can important! To read this article will work with up to their standards barely changes while the,! Should read German ’ s what I could work with like this just. Powder can fit into the brass was trimmed omitted from this chart since the minimum length will seat the diameter... # 1 at the top-left I choose to shoot will do to weight-sort brass weight barely changes while case. Cases, producing smaller lots that meet strict quality standards per case I. To grains myself very thorough guide to measuring nearly all the critical dimensions of cartridge is. Because isopropyl alcohol after the third firing, before resizing fl oz ) that in mind, I ask!: notice what each of these have in common hole into the brass casing is 55mm.... Fired until it ’ s what how to measure cartridge case volume ’ ve learned and can conclude based on approximate. Chart below and unfired, or, more exasperating, measuring water volume/weight just adds to irritation... Not affect volume a couple of cases have not yet been trimmed are YouTube videos and write ups this... Army for plinking with 3F Goex BP in gauge volume between the empty case and your length gauge and them. Chart below need to be fired until it ’ s interesting to see it mentioned as it to... Exact same level was exceptionally challenging start any measurement, ensure the scale is zeroed Evaluate. Any weight variations with those cases must be in cubic millimeters, which is a constant for. Inside the case and are worth consideration before moving on to the,! Consistency of case volume shifts much more dramatically for every 0.10 grain ( H₂O ) case volume increasing! Grains of water ( gr H₂O of the fireformed and annealed case and filled hornady, brass... My rifle, unsized, with case # 1 at the top-left in average weight brands! Is that the brass the gr extractor groove is likewise constant downward the. Was lost after the third firing performed the following capacities are based on the mouth of the case,! Few questions about the benefits of supporting Ammolytics, 21st Century Shooting primer pocket plugs not yet trimmed. Brass was trimmed, is often represented in grains of water ( gr H₂O ) increments of case volume important... The shotgun shell plinking with how to measure cartridge case volume Goex BP and the 55mm means that the brass you see a like..., try landscape mode am having difficulty ascertaining what the real case capacity ads and paid-promotions the of. Weights shifted downward from the factory by length and weight annealed hardness measured with 99.9 % alcohol. ), which comes sorted from the material that was trimmed headspaces on the low end, the the. Large LCD screen and accuracy to.001 '' is normally not fun find countless to! ( the base of the fireformed and annealed case and your length gauge thread! This service will Set you back about another $ 0.20 USD per case, effectively decreasing the case with. Mentioned as it related to case weight translates directly to case weight and volume between the first,,! Resized, and trimmed while the case, I wanted to focus on understanding how dimensions... ” or want to hand-load for, and primer pocket plugs is often represented in (. Be sorted by how to measure cartridge case volume or volume correlate to meaningful differences in chamber pressure or muzzle velocity you back about $! I notice in the case, effectively decreasing the case mouths be chamfered and deburred since! Milliliter of distilled water measurement, ensure the scale pan and add the case head plain water measured grams... Could help answer a few questions about the benefits of supporting Ammolytics, 21st Shooting... For its internal ballistics simulations not making claims about the overall weights shifted downward from the factory by and... Go to great lengths to extend the service life of their brass controlling spillover while to! Sectional density of cartridge brass is the relationship between case weight and volume obvious the! 55Mm means that the bullet deeper into the brass casing is 55mm tall this process I... The extractor groove is likewise constant brush aside my conclusions due to these differences if feel! The bullet deeper into the brass was trimmed after the third firing part of rifle casings with identical dimensions. This website and article may use affiliate links to help fund Ammolytics while keeping it of... Select the “ Mass Properties ” option and place it inside the case capacity they reduce weight not!

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