Estimates of Useable Case capacities

Some words about usable case capacities
The P-Max simulator requires the capacity of the case behind the loaded bullet to be entered as the usable case capacity. The best way to get this number is to measure it yourself, and you are strongly encouraged to do that. However, the estimates to the right will give you something to start with and allow you to get some idea of the performance of that particular cartridge. The listed case capacities are estimates of the capacity in grains of water up to the bottom of the case neck, where the base of the bullet might be expected to be in the loaded case.

Remember, cases from different manufacturers for any particular cartridge can differ in case capacity by surprising amounts and you should not assume that the case capacity listed is the capacity for your particular cases.

Remember too that for any particular calibre, heavy bullets will be longer than light bullets. If a given cartridge is loaded for the same cartridge overall length for heavy and light bullets, (to fit in the magazine, for example), heavy bullets will sit further back in the case and so the case capacity with heavy bullets will be less than the case capacity with light bullets.

 
Rifle Cartridges
17 Remington 26.5
204 Ruger 29.1
22 Hornet 12.2
218 Bee 15.5
222 Remington 26.0
223 Remington 28.8
222 Rem Mag. 29.2
5.6 x 50 Mag. 30.0
225 Winchester 40.6
22-250 42.5
220 Swift 49.0
6mm PPC 29.9
6mm BR Norma 34.1
243 Winchester 52.8
6mm Remington 53.7
240 Wby Mag. 63.1
256 Win Mag. 18.1
25-35 Winchester 33.0
250 Savage 43.2
257 Roberts 53.2
25-06 Remington 64.0
6.5 x 47 Lapua 43.5
6.5 Creedmoor 49.5
260 Remington 51.5
6.5 x 55 Swedish 56.8
6.5 - 284 Norma 60.4
6.5 Rem Mag. 66.0
264 Win Mag. 81.7
270 Winchester 65.4
270 WSM 74.4
7mm-08 Remington 51.2
7 x 64 Brenneke 60.3
7mm Mauser 56.8
284 Winchester 61.3
280 Remington 67.7
7mm Wby Mag. 80.8
7mm Rem Mag. 81.3
30 Carbine 15.5
300 AAC Blackout 21.0
7.62 x 39 31.4
30-30 Winchester 37.8
30 Remington 37.4
300 Savage 49.1
307 Winchester 49.2
308 Winchester 49.4
30-40 Krag 53.8
30-06 Springfield 61.6
300 WSM 75.0
300 H&H Mag. 82.2
308 Norma Mag. 80.0
300 Win Mag. 86.8
300 Wby Mag. 96.5
303 Savage 40.4
303 British 50.6
32-20 Win 17.1
32 Remington 38.1
8mm Mauser 56.9
8mm Rem Mag. 93.9
338 Win Mag. 78.3
340 Wby Mag. 91.0
338 Lapua Mag. 100.1
348 Winchester 66.7
35 Remington 44.0
356 Winchester 44.9
358 Winchester 47.4
350 Rem Mag 62.7
35 Whelen 63.6
375 Winchester 40.5
375 H&H Mag. 86.5
416 Rem Mag. 92.4
416 Rigby 115.4
470 N.E. 125.3
50 BMG 230
 
Pistol and Revolver Cartridges
32 Auto 7.0
32 S&W 6.2
32 S&WL 12.1
32 H&R Mag 14.8
9mm Luger 11.4
38 Auto 15.5
9mm Win Mag 20.4
380 Auto 7.5
38 LC 14.8
357 Mag. 17.8
357 Rem Max 27.7
38 S&W 9.5
40 S&W 10.6
10mm Auto 14.6
44 S&W 25.9
44 Rem Mag. 25.2
45 Auto 17.6
45 Colt 29.8
45 Win Mag. 29.3
454 Casull 33.8
50 AE 35.4