I like .357 sig because it essentially bridges the gap between the .30 tokarev and the 9mm luger.
.311 85 grain SD = .126
.355 115 grain SD = .130
.357sig 115 grain MV = 1550 fps, 614ft-lbs (102mm barrel)
7.62x25 85 grain MV = 1230-1720fps, 290-560ft-lbs (120mm barrel)
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