If I was going AR 10 I would go 22" 243.
It would be like a meat saw. As a matter of fact I have an upper on backorder.
22 Nosler and 50s at 3600 is doing the trick for me though. 223 is a little weak for marginal hits. I like an edge when I can get it.

Edited by varminter .223 (01/15/19 09:36 PM)