I'm wondering about a lighter bullet . I think it's the 125 gr. .357mag that's suppose to be the ultimate fight stopper . Federal lists their 125 at 1450 fps and 584 ft.lbs. at the muzzle . Underwood lists a 135 10mm at 1600fps and 767 ft.lbs. . Personal defense maybe it's the light bullet you need . Not sure what they used for barrel length.