I have both S&W model 29 (.44 Mag) and 57 (.41 Mag) with 6 1/2" barrels. When I shoot full power loads they feel the same.
If I could only have one, I'd choose the .44 Mag as it gives you a bit more options.
Using the Hornady 7th Edition reloading manual as authority, I find that it has several maximum loadings for a .44 Mag (.429") with a 240gr. jacketed bullet at 1400 FPS, and for the .41 Mag (.410") it has several maximum loadings for a 210gr. jacketed bullet at 1400 FPS. Not a whole lot of difference, but a measurable difference.
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Last edited by Mello2u; December 6, 2012 at 02:59 PM.