10mm. It can have as much as 750+ ft pounds of knock down power at 25 yards. It is very close to the .41 magnum. The 10mm is a great round for self defense and/or hunting, it is just expensive. I like the 10mm much better than a 40 S&W.
I agree the 10mm is a bit more powerful than a 45GAP or ACP and probably a better stopper but the 41 Remington is quite a bit more of a cartridge than the 10mm. The heaviest bullet commonly loaded in a 10mm (200 grain) is the lightest bullet commonly loaded in a 41 rem. And were a 10mm can be loaded safely up to 750+ ft-lbs of muzzle energy the 41 Rem can be safely loaded at 950+ ft-lbs at the muzzle. Given the range of bullet weights and muzzle energy of the 10mm its probably a better comparison to compare the 10mm to a 357 Magnum if you want to compare it to a revolver cartridge.
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