We all know the 10MM is not a 41 Magnum, but it is interesting to see how some of the hot 10MM loads stack up to the 41 in shorter barrel lengths (I think most manufacturers publish their ballistics based on an 8 3/8" barrel).

We tested Underwood's 200 GR XTP 10MM and got 1250-1300 fps from a stock GLOCK 20 which comes out to about 700 ft-lbs of energy.

By comparison, Speer Gold Dot 210 GR 41 MAG average around 1220 from a 4" S&W 57 which is also about 700 ft-lbs of energy.

I consider the Gold Dot 41 load to be an "average" 41 MAG factory load. I'm curious if anyone else has done testing on 41 MAG loads in this range and/or what you are able to get from the hotter 41 MAG loads out of a 4" barrel. Obviously these would exceed the 10MM.

Interestingly we also tested the Federal 44 MAG 240 GR Hydra Shock out of a 4" Mountain Gun and got 1100 fps which I think is around 650 ft-lbs of energy.

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Aaron Terry