The .357 Sig uses a small pistol primer. As far as loads go, you don't specify bullet weights, and if I were you, I wouldn't put too much trust in loads you get here (including me). FWIW, I use AA #7 for my .357 loads. You can go to their web site and get information about .357 loads with Accurate Arms powder. Hope that helps some.
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Regards - AZFred
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