MINIMUM CHAMBER DIAMETERS RIMFIRE AND CENTERFIRE PISTOL AND REVOLVER | Minimum chamber diameters (inches) |
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| Chamber | Rear | Front |
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| 9mm Luger | .395 | .381 | | 22 Rem Jet CF Mag. | .380 | .252 | | 221 Rem Fireball | .3804 | .254 | | 25 Auto | .2841 | .2792 | | 256 Win mag | .3819 | .286 | | 30 Luger | .3971 | .3322 | | 32 Short Colt | .320 | .320 | | 32 Long Colt | .320 | .320 | | 32 S&W Long | .3415 | .3395 | | 32 Colt New Police | .3415 | .3395 | | 32 S&W | .340 | .3395 | | 32 Auto | .344 | .339 | | 357 Magnum | .381 | .380 | | 38 Short Colt | .3805 | .379 | | 38 Long Colt | .3805 | .379 | | 38 Colt New Police | .390 | .388 | | 38 S&W | .390 | .388 | | 38 Special | .381 | .380 | | 38 Special, Match, Wad Cutter | .381 | .380 | | 38 Super Auto | .389 | .387 | | 380 Auto | .3825 | .377 | | 41 Magnum | .437 | .435 | | 44 S&W Special | .459 | .458 | | 44 Rem. Magnum | .460 | .458 | | 45 Colt | .487 | .480 | | 45 Auto | .4812 | .474 | | 45 Auto, Match, Wad Cutter | .4812 | .474 | | 45 Auto Rim | .4794 | .473 | | 455 Colt | .481 | .481 | | 22 Short | .2291 | .227 | | 22 Long | .2307 | .227 | | 22 Long Rifle-Match | TBA* | TBA* | | 22 Long Rifle-Sporting | .2307 | .227 | | 22 Long Rifle Shot | .2284 | .2236 | | 22 Win. Rimfire | .2462 | .2441 | | 22 WMRF | .2240 | .2430 | | 32 Short | .3225 | .319 | | 32 Long | .3225 | .319 |
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