I'll admit I'm a ballistics junkie, ballistics interest me. I am not trying to start a flame war either, both cartridges are excellent. Watching Guns & Ammo TV this evening and Dick Metcalf was saying a 10mm in a G20 was fully equal to the .41 Mag. While I've seen hotter loads for the 10mm, I'll provide comparative ballistics from Hodgdon Powder's reloading data. As close as possible to an apples to apples comparison. Max loads were: 10mm, 5" barrel, 200gr @ 1172fps/610 ft lbs energy, 35KSI .41 Mag, 10" barrel, 210gr @ 1631fps/1241 ft lbs, 36.4K CUP While the longer barrel certainly helped the .41 mag numbers, it would undoubtedly have substantial edge even with a comparable barrel length. Don Wanna kill these ads? We can help!