Pretty simple. There is already a standardized NATO pistol cartridge, and it's not now and never will be. 357 Sig. With all due respect, bottlenecked pistol cartridges are generally a bad idea, and the. 357 Sig is no exception.
What about the 7.62x25? I love this hot pistol round. I've only shot it through my cz52. I have often wondered why there weren't other pistols that used this/or carbines. I think a modern day ppsh smg would be amazing. (shooting very hot rounds very fast) must have been a devastating gun to have been on the wrong side of...