.357 Mag if you don't mind the rather large grips required for it to be used in a semi-auto. Than again, any 10mm will have a rather large grip also.
But your .357 stockpile can also be used to feed a variety of other firearms, including many classic revolvers and lever guns. 
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Mauser Werke, Schmidt-Rubin, Colt, Walther, HK, Weatherby, Sig Sauer, Browning, Ruger, Beretta, etc, etc....a few friends of mine
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