.45. Tens of thousands of dead fascists, commies and islamic terrorists can't be wrong.
I have been looking at some guns to carry and want the most knockdown power I can get, but I cant decide between the 10mm or .45acp. Anyone have any input?
That's one reason why .454 Casull, .500S&W magnum, etc. are not great choices for personal defense. Too much recoil and muzzle flip.
there is no such thing as "knockdown power."