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What is the most used round for semi auto's today? I'm not looking for opinions on which is better, just the most in use today by both law enforcement as well as regular shooters.

Hi all, I have a feeling that the answer is no, but I wanted to ask just to make sure. I've got a Ruger Old Army and I was wondering if anybody made a black powder rifle that could make use of the same .457 ball. I understand that a rifle uses a patch so the bore size must account for that...