Close but no cigar:

460 grain cast for the 458 Win Mag and other 458’s. Alloy is 20 pounds wheel weights to 1 pound Babbitt. The Babbitt I used is 90 per cent tin, 7 per cent antimony and 3 per cent copper. Gas checked, sized and lubed. I made the mold several years ago, thinking about making another with more flat area up front. Front grove is the crimp groove to keep the bullets in place under recoil (for the cartridges in the magazine that is). Front of the bullet ahead of the crimp groove is bore diameter.