Purely for educational purposes, since <6mm is the minimum in this state, a .223 works great if prudent judgement (range, angle, game, etc.) is used while hunting. Killed my first Sitka Blacktail with a Mini-14 and many after. I would say a large percentage of late season beach hunting in SE AK is carried out with an AR in .223. A .17 Rem does great things to a deers brain as well!