I have always thought the concept of using 10mm as a submachine gun cartridge was viable. I know that HK made an MP-5 variant with a straight magazine.
I come by this premise from no particular expertise, just the reasoning that the elongated SMG barrel might provide the opportunity to wring out some pretty impressive velocities and increase the likelihood of reliable expansion.
Then again with modern ammo advances, 9mm is certainly an improved performer that provides negligible recoil in a SMG.
US Army Military Police 97-03
Federal LEO/M.R.T. 05-Present
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