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...
"I crapped my pants to avoid the draft!!" -Ted Nugent