Cut your alloy down to 4-5% Sb, add a heaping tablespoon of Zep root killer to 10# alloy and mix it in. Alloy at 725ish and mould @ 400F. Cull anything from the mould that looks bad. Quench some from the PC oven & compare results. Works for my 30cal 1:8 PB @ >2k fps. Cu gives hardness with malleability plus strength for the fast twist. Plus I find that my cast have very few surface imperfections. If I pour good, all I ever get is the occasional small C shaped defect from crud out gassing. That small flat nose may require a good spud for seating straight.
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