Ever notice the folks who claim the .223 can't kill deer cleanly, never actually tried one on deer? I used to squawk this fallacy and believed it. Then, I got an M4, loaded it with a 62 grain Barnes TSX handload, shot a deer purposely in the shoulder rather than make an easy head shot from 30 yards, and guess what, it died. It did run about 25 yards before it keeled over, but keel over it did.
I kind of know better now. But, I do have bigger calibers with which to hunt and I'm not that enamored with the AR platform, LIKE it I do, just ain't that in love with it. It is a really nifty little rifle, though, accurate, and reliable. I've taken to keeping it in the bedroom with the green light on it for critters in the night or 2 legged predators if that ever happened which, out here, is doubtful, BUT possible. I have a 30 round mag of FMJ in the gun and a 10 round mag ready to switch to with my Barnes hog loads in it should I be invaded in the night, yet again, with pigs.
You know, I distinctly remember back in the 60s, conversations that the .257 Roberts wasn't enough gun for deer. Then, the .243 came along in the late 50s, early 60s and it was illegal in Texas to hunt with it, had to be at least 25 caliber. That law got changed real quick as the .243 got REALLY popular. But, even today, some folks seem to think a belted magnum is needed for deer and hogs. That's their choice. I know better. A large number of deer I've shot in my life, most, were killed by the .257 Roberts. My favorite bullet for it is a 100 grain Sierra Game King. All, but one I ever shot with that rifle were bang flops. I've killed deer out to 200 yards with it, most were inside 100. But, nobody now days thinks the .257 ain't enough, well, not that many. I'm sure there are some knuckle dragger hold outs.