My great grandfather-in-law was a sustenance hunter. In almost 90 years of hunting he only every owned a .22 rifle and he would go into the woods and come out an hour or so later with a deer slung over his shoulders. The game wardens in the area knew him and knew, as we did, that he never missed or made a shot he was unsure of. There was never a case of finding a carcass in his woods or the area around there with a poorly placed .22 bullet. The problem isn't that a .223 isn't capable of being used as a legitimate hunting round. It is those who would abuse the privilege of using it if it were allowed in all 50 states.