Joe mentioned the arm a person is using is also a part of the equation. I am using a 33" Harmon/Large barrel, 8 grooves, deep rifling, and a 1x48 twist. The bullet started life as a Lyman 575213, was bored out and faced off to become a wad cutter that weighs about 465 grains.
Be safe, have fun, and then fine tune everything to what you like!
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