Actually cops aren't supposed to kill, they are supposed to stop. Killing is just an unintended consequence. As to soldiers, there is the theory that if you seriously wound an enemy it takes two to care for him. But of course that only applies is some cases.If you are not a cop or a soldier the purpose of your firearm is to break engagement with your attacker - not to kill. Start shooting a 22 or a 380 at someone inside of 15 yards and they are almost 100% likely to break off. The 380 is preferable to the 22 because center fire ammo is vastly more reliable than rimfire. But high quality 22lr ammo such as CCI Mini Mag 36g HP will bring quite respectable reliability to a quality rimfire semi auto pistol.
As far as .22LR, CCI Uppercut, Federal Punch, and other defensive ammo will certainly up the effectiveness.If you are not a cop or a soldier the purpose of your firearm is to break engagement with your attacker - not to kill. Start shooting a 22 or a 380 at someone inside of 15 yards and they are almost 100% likely to break off. The 380 is preferable to the 22 because center fire ammo is vastly more reliable than rimfire. But high quality 22lr ammo such as CCI Mini Mag 36g HP will bring quite respectable reliability to a quality rimfire semi auto pistol.