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There is a formula, Greenleaf??? something like that it establish bullet by length, to match the twist. Sence I don't make bullets and Bullets are sold by weights, I select the bullet by weight and then see which one works. A Hornday 225 grain may work better than a Sirocco 225 grain, I think for many of us, it is trial and error. Sence density and length are closely similar.. it is 6 of 1 half a dozen of the other which is getter.
Gene, you way ahead on me on bullets, I don't swage. I was thinking of buying a .318 die to make bullets for my 88 Commission.
It has always amazed me, how percise a person can get. I watch a guy go through shims, and he could feel the thickness. He would tell me the thickness of the shim pack, then use a caliper. He was 100%.
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