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My Sig P-220A has digested everything I have put in it, so far. You might consider Alliant Unique. It works for me. Bullseye and W-231 are good too. I haven't had my Sig for too long yet, but 230 gr. hardball commercial reloads, 230 gr. cast lead, and 200 gr. cast lead semi-wadcutters have done real fine for me, with no feeding problems encountered.
Paul B.
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