If you are after velocity then the 8-3/8" barrel is the way to go. I haven't clocked my full house .357 loads but I get 1500 fps with a 245gr hard cast swc in my .44 M29 using Elmer's favourite load of 22 grains of 2400. I have shot three rounds into 1-3/4" at 100 metres (2 handed rest) with that load.
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