why do some bullets list their diameter at .429 and some at .430?
I usually shoot the .429 diameter bullets but ran across a good deal on the .430 variety,is there any real difference?
is .001 really going to make any difference?
Lead bullets are typically one thousandth over. I suppose some companies might make jacketed bullets in .429 and .430 too, but I don't know why. Slug your barrel, if it's no smaller than ~.428, the .430's should work fine. Be safe, and back off on your load a little & work back up though.
Walt Melander of NEI Handtools (mould maker) once told me that a cast bullet should be made to fit the chamber mouth rather than the barrel diameter. Of course, if there's a gross difference, a person would have to find a happy medium, but if the chambet mouths are only a couple of thousandths larger, the cast bullet should be sized to fit the chamber as closely as possible instead of the barrel.