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Rifleman Q&A: Why Didn't The U.S. Army Issue .45 Auto Rim?

Q: If the .45 Auto Rim cartridge doesn’t require the use of a cumbersome half-moon clip in order to be ejected from the Model 1917 Colt and Smith & Wesson revolvers, why wasn’t it issued to our troops armed with M1917 revolvers during World War II?

Clapp on Handguns: New .45 Auto Rim Loads

The .45 Auto Rim still has a cult following, but none of the major makers produce the cartridge.

.45 Auto Rim In .45 Colt

Aside from differences in the dimensions of the cartridge case, the Auto Rim round has a significantly thicker rim, approximately 0.090" versus approximately 0.060".

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