within 100 yards .223 is devastating. Could be something better now but 10 years ago all police agencies used 55 grain ball for duty because it had the best performance at close range. Generally will not pass through sheetrock walls believe it or not as it just has too much velocity and fragments on contact. Definitely will not go through car doors at close range either.

When I worked as Mason County one of the deputies killed a guy on a warrant service with a .223 from 25 yards, they guy came out with a shotgun and was going to take out a DOC fugitive apprehension guy. Anyways the deputy was in the bushes near the front door and the suspect had no idea when he raised his shotgun up and took a doubletap to the chest. At 25 yards, 55 grn ball, two shots in the chest no exit wounds. Upon autopsy very small fragments recovered and liquified lungs.