I've used both, and prefer a bolt rifle. Probably goes back to my first rifle, a bolt action 22, and the fact that I just happen to like bolt action rifles for hunting. As far as what cartridge, I shoot 223, 22-250's, and 243's. There's nothing wrong with an AR, providing you find one that's accurate enough for those longer shots, as the lower price AR's are sometimes not exactly tack drivers.
