There is an a serious element that is being lost here. .40 S&W and other expanding rounds do not tend to fragment. The .223 does. When entering body tissue or, alternately, gelatin blocks the round will fragment, sometimes many times over. When facing dry wall, concrete blocks, or other "intermittent barriers" the .223, or at least the 5.56 loaded to NATO specifications, will penetrate MUCH farther. So the specifics are important here.
11/11/13 at 6:47pm