I’m toying around with the idea of a battle rifle or CSASS built around a 16” barrel chambered in 6.5 CM. I’ve built three AR10s in the past, all with 18” - 20” barrels, and I’d like to have something a bit more compact. I’d also like to try 6.5 CM as it seems to be all the rage these days. Realistically speaking, how does 6.5 CM compare to .308 when fired from a 16” barrel? I’m particularly interested in impact energy generated.