I've eaten a lot of deer shot killed with .223s and 6.5Gs. I've also helped people try to find a lot of deer lost with 6mms. I'm sure whatever you choose will work if applied carefully; even a slow 6mm.In fairness, the buck I shot with the AR 2 seasons ago was 1 of the bloodiest 40 yard sprints I have ever seen. However, it is the only one I have ever shot with .223, it was at probably 60 yards, broadside no quartering, heart shot, and an inexpensive lead soft point from Hornady. Main thing about changing the caliber is I would like a little more wind resistance. .223 does get bullied a little bit in stiff wind. And, in all reality, I just think the 6mm ARC is cool.
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***Forgot to add last sentence. Some states don’t allow .22 cal so I figure the .24 cal will help avoid a headache later down the road since I do like travel out-of-state.