Originally Posted by Firearms4ever
Any revolver chambered for the .45ACP can also fire the .45 Auto Rim. The reason is, because a revolver chambered for .45ACP has to use either full moon clips or half moon clips to chamber it, so the .45 Auto Rim is basically a .45ACP with a rim.
I can chamber and shoot 45ACP cartridges in my Smith and Wesson 45ACP revolvers WITHOUT a full or half moon clip. The chambers are head spaced internally and the clip serves only to extract the fired cases. In the absence of a clip, I can use a 3/8" wooden dowel to push out the fired cases.
This doesn't work with Colt revolvers because the chambers are bored completely through and the clips are needed to head space the cartridges.
The 45 Auto Rim cartridge solves both the head space and extraction problems in all 45ACP revolvers.