Might only apply to humans and elephants, but to slow down movement, wound one of the unit. Usually the one near the middle
Hence the military's shift to .223 (m-16, m-4 etc.)
shhhh! Don't tell all those Rambo wanna-bes buying up every AR they can get their grubby little fingers on... You want to mess up that super-hot market?
Geeze... Next thing you'll be saying is you can't make head shots at 1000 meters with an offhand grip on a 9mm pistol like they do on TV.