Originally Posted by
Compost
So for military purposes there are two reasons why 9mm medium power pistol ammunition is better than 10mm high power ammunition that also weighs more. One, a lightly built male (or female) can better control a 9mm pistol because it has less recoil energy than the 10mm pistol. That heavier recoil is less of a problem with a 10mm SMG but still somewhat applicable. Two, for a given system weight the lighter 9mm pistol and also SMG can deliver more of those almost inevitable or irrepressible follow-on shots. And more initial shots also.
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