.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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1944 Mauser byf K98 8mm, K31 7.5 x 55 Swiss, Rem M700 Classic 8mm, 1920s Colt New Service .45 LC, Browning Hi-Power and HK P7 in 9mm, SAIGA .308 22", SKS 7.62x39mm, S&W 686 Plus 6" and Taurus 617 2" in .357 Mag, Ruger MkIII Target 5.5" BB .22LR, Mossberg 500 & Marlin 120 in 12 GA, etc.
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