It is possible that's it could be a .32 caliber so don't go loading up on .36 until you mic the barrel. .32 is RARE but some folks liked them for squirrel guns. My money is on .36 caliber.
Here's a side by side pick of the muzzles. The .45 is on the bottom. I'd think there'd be a bigger difference for a .32. (Yes, I made sure they weren't loaded before I took the pic.
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