Weird as it sounds if you go to a slightly "softer" bullet in the .44 Mag you can get higher velocities and less "leading". It has to do with the time at which the bullet obulates (sp.) (seals barrels from the hot gases pusing it). The hard cast takes a fraction of a sec. longer and allows hot, cutting gases to get past and cause leading from side of bullet.
I can drive a lead bullet in my 444 marlin at over 2000fps with very little leading (even in a micro groove barrel!).
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