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It sounds like you want to go for accuracy. Therefore, I suggest searching the Cast Bullet Association site for "indexing" and "bullet fit".
If one joins the Cast Lead Bullet Association, one receives their bi-monthly journal, "The Fouling Shot", where in, along with informative articles, they post the results of CBA sanctioned shoots and the relevant data concerning powder, case, caliber, bullet, bullet alloy, etc., used. You can therefore see what the winners are currently employing to get the accuracy to compete in the cast bullet matches.
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