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One problem w/ .357sig is potentially the pressures. However, the 995 IS rated for +p and +p+. 9mm(standard pressures) go up to ~33000 cup, Whereas .357sig goes up to ~38000 cup. So potentially you might could from that standpoint.

Then theres the issue of case diameter. The removal of chamber material to make it fit may cause enough of a reduction in strength to make it no longer safe for the higher pressures.

Also the .357 sig cartridge is significantly shorter than 9mm.
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