It will out run a 223 but not by much. If I could stuff a 22-250 into and ar15 upper I would be where i need to be. I have a 6.5 Creedmore uipper that I had built way too heavy to drag around in the woods. Looking at changing that problem but ran into the 6mm Creedmore. Right now i am looking at 243 uppers for the ar10. There goes my retirement, lol.
I saved alot on my insurance just by switching into reverse and fleeing the scene of the accident.