crazy lady - a 223 = an m-16 on single-shot
an m-16 on single-shot can fire between 30 and 40 rounds per minute - and that's for a slow, inexperienced shooter. a practiced shooter can get off 45-55 rounds in a minute - emptying the clip in less than a minute and reloading within 50 seconds total.
that may not be "high-powered" for 10-division battle in WW2'
but when you're up against civilians, even adults who can run rather than kids ln a room, that 30 round clip in a 223 rifle might well have been an A-Bomb