.223 calibre in the right hands is lethal. I shoot most of my deer with a .223, projectile choice and shot placement is key. Deflection in thick bush is an issue to consider, not that I have experienced it. Open country shots out to 250m or even 300m is not difficult with practice. You would have to accept that you will need to let some animals walk away, as the opportunity for a good shot may not arise. I don't use my 223 in the roar, big fired up stags, shots under pressure are generally combos to avoid.
From all accounts new good branded AR-15s are pretty accurate rifles, so placing a shot in the right spot is not going to be an issue in the right hands. They are very ergonomic, light, handle well etc., so carrying one is easy also. Reliable, so no problems there. The only pitfall some would see with hunting with one in bush would be having to carry it loaded and on safe, as you can't chamber a round quietly, in open country you would probably carry on an empty chamber. They have very reliable safety mechanisms so personally don't see loaded carrying as a major negative factor. I would use one if I didn't already have a nice .223 that I love shooting with.
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