Is .635 Cal. the same as .25 Acp? This was in my fathers collection when he passed away. I have no plans to shoot it, just curious.
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Just walking on the edge of of my grave.
Thanks, I thought it might be but I wasn't sure.
A .635 caliber would be one big handgun. The 20 Ga. is .620 must be modern math. A .25 caliber in metrics is 6.35  caliber.
That would make more sense. Poor decimal point placement on my part i guess. I was just so happy to post a picture without a problem I got confused, which happens more and more the older I get.