hunting with a 556/223 is all about shot placement. liitle off and the beastie is hightailing it for the next county.
hollowpoints are a strict no go as are vmax or ballistic tip type bullets. you need a solid soft point the heaviest your rifle can handle.
that being said i dont recomend it at all unless your a damn good shot and know the anatomy of the critter your taking a poke at. while the 556/223 is a superb manstopper and an exceedingly excellent sd round, game animals are orders of magnitude tougher than people.
if you relly want to hunt with an AR get a 458socom, 6.8, 450, or 300 upper for your ar hunting needs.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...