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Now select 10 cases that are the same weight, fill the 10 cases with water, weigh again, deduct the empty case weight, now you have a volume measurment. If the weight of the empty case gave you the correct final answer, the volumes would all be the same, right? same weight, which allowed them an advantage against a typical NVA unit armed with Type 56-1s. Remember, everything else in this batch was identical, except I painstakingly sorted spent cartridge cases to pick new vintage Lake City once-fired cartridge cases only. Cases can vary greatly in weight among makers. Dr. John Woods 08.07.17. Again, I fired five different 5-shot groups and measured the diameter, center to center. In July 2012, the Army solicited a request for vendors to supply alternative cartridge cases to reduce the weight of an M855A1 5.56 mm round by at least 10 percent, as well the for 7.62 NATO and .50 BMG rounds. There is little doubt that the vast majority of ammunition is loaded with brass cases. In general, modern cases are slightly thicker and heavier than older ones for the same cartridge. Guess what, it will not be so. ment of a thin-wall steel cartridge case for GAU-8 ammunition. The LD is basically "how full" the case is of powder. That is how many 100 grain cases to make one pound; seventy.) Weight an empty case in grains. Heavier cases will have less capacity, with every 8.5 gn of brass displacing about 1 gn of water capacity. However, for some handgun ammo loads there is an option. Lastly, there is the concept of loading density, or LD. Since there are 7,000 grains per pound, divide the weight of the empty case in grains into 7,000. This is certainly the situation with rifle ammunition, but for the most part revolver and pistol ammo as well. The following capacities are based on the approximate weight of plain water measured in grains and were acquired from various sources. Rifle Cartridge Case Capacities Compiled By Chuck Hawks. if the case weighs 100 grains, divide 100 into 7000 and you will get 70. The objective was to develop a steel case with weight as near as practical to that of an aluminum case while achieving greater interior propellant volume and offering the potential for a lower cost case in mass produc-tion. Rifle Cartridge Cartridge weight Weight of loaded magazine 10 kilogram ammo load M14 7.62×51mm 393 gr (25.4g) 20 rds @ .68 kg 14 mags / 280 rds M16 5.56×45mm 183 gr (11.8g) 20 rds @ .3 kg 33 mags / … I sorted 100 Lapua .223 cases and they range from 95.3-96.2 grains (by weight, not volume) I separated them--50 at 95.3-95.7, and 50 at 95.8-96.2 grains. 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 is commonly stated as the charge weight divided by the net case capacity in gn of water. And it doesn't matter if you are counting cases, powder or bullets. While it is based on a 10 mm case necked down to accept 0.355-inch (9.0 mm) bullets, the .357 SIG cartridge case is slightly longer than .40 S&W by 0.009 in (0.23 mm) to 0.020 in (0.51 mm) total. Segregate the cases into groups by weight. The cartridge provides the pressure, on functioning, to project rifle grenades when using a grenade projection adapter. Group 1: 2.34” Group 2: 1.81” Group 3: 2.13” Group 4: 1.34” Group 5: 2.15” Type Classification: OBS - MSR 11756003 Shown in Figure 1 are two successive designs of thin-wall case Most .40 S&W pistols can be converted to .357 SIG by replacing the barrel, but sometimes the recoil spring must also be changed. The cartridge is identified by a rose-petal (rosette-crimped) closure of' the cartridge case mouth. Brass vs Aluminum Cartridge Cases. (e.g. Am I being too fussy? Grains and were acquired from various sources is the concept of loading,. 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