DIMENSIONS
SJS: You're on the right track by measuring the cylinder throats. You should fire bullets that are 1/1,000ths over the throats, so .429 is a good choice. As tomf52 stated, bullet hardness is less important than size.
I've shot velocities over 1,100 fps with soft bullets (20-to-1) using 1,000th over groove with excellent long range results.
If you want to be exact, slug your barrel for the groove diameter & at least make sure the bullet is over that dimension.
Good Luck, Hank M.
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