Quote:
Armor penetration is not a valid consideration for any handgun round. Modern armor, even in soft versions is very capable of stopping any of the listed calibers. Even the miracle 5.7 can't get through a level 4 soft vest and still be capable of doing a lethal amount of damage, let alone any grade of hard armor.
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I totally agree with this, but on the other hand wonder why still new PDW calibers are developed and actually issued (e.g. the Chines switching from 9mm to their proprietary 5,8 x 21mm)...