.45 Auto Rim

But if half-moon or moon clips are not used when firing a rimless cartridge in a revolver, the spent cases must be ejected by hand—either by shaking the revolver and its swing-out cylinder or by poking the cases with a rod or field-expedient tool, like a pencil—as the revolver's extractor cannot grab them. The second issue concerned headspace. In revolver cylinders not engineered to allow.45 ACP to headspace properly, as in early production Colt M1917s, the cartridges could slip forward, stopping them from firing. Adding a rim to the.45 ACP cartridge solved both these issues. • Illustration —.45 Auto Rim/.45 ACP cartridge Loads offered were similar to the standard military loads for the.45 ACP, but with fully lead bullets rather than the full metal jacket bullets used for.45 ACP. This was done to reduce barrel wear in the shallow rifled revolvers in which it was to be used. The round is currently still in production by Corbon in their DPX and Performance Match lines of ammunition and is also manufactured by Georgia Arms and Buffalo Bore Ammunition.

• Name —.45 Auto Rim • Type — Revolver • Origin — United States • Design Date — 1920 • Manufacturer — Peters Cartridge Company Remington Corbon • Production Date — 1920–present • Case Type — Rimmed • Bullet — 0.452 • Neck — 0.4685 • Base — 0.4709 • Rim Dia — 0.5154 • Rim Thick — 0.0827 • Case Length — 0.9004 • Length — 1.2646 • Primer — Large pistol • Max Pressure — 17400 • Pressure Method — CIP • Max Cup — 15,000 • Bw1 — 160 • Btype1 — JHP • Vel1 — 1050 • En1 — 392 • Bw2 — 185 • Btype2 — LRN • Vel2 — 800 • En2 — 264 • Bw3 — 230 • Btype3 — FMJ • Vel3 — 855 • En3 — 375 • Bw4 — 230 • Btype4 — FMJ • Vel4 — 750 • En4 — 287