you do know archers are actually aiming at specific things, like heart, lungs, etc and not just the chest - right? You don’t seem to understand how hunting works. (Hence your fixation on brain shots - a terrible idea for a number of reasons)Archers take big trophies all the time, and can't reliably get chest hits at half the range as a braced AR 223 can reliably brain such critters. Just use a walking stick to brace standing shots, if brush wont let you sit and use your framepack to brace the rifle. A 6" brain circle is an easy mark from offhand, really, at 100m.
And let's also not forget that in a LOT of States, It's not Legal, or considered "Ethical" to take large (Especially Dangerous) Game with a .223/5.56. if he tried that Head shot on a Bear, and was a HAIR off, it'll bounce right off that sloped Skull, and then the Poor bear will have indigestion from eating Greasy Asshat.If Mel says you can't hunt with a bolt action, then dammit, it must be gospel! Never mind the millions of LEGAL game that has been taken with a bolt action an even with of all things a .308! Guess all the other hunters of the world are wrong not to be using a POS 10in AR an a pocket nine. Or the chopped cobbled Stars or 22 Berettas. Just get sick of hearing this all the time, heard it since back in the 70s, nonstop.