have them all,6.8 wins hands down for a deer/hog rig and will fit your lower fine, ammo is easy enough to get these days. a 16" barreled six 8 is my preferred carry gun. the .223s just sit in my safe any more. the POF .308 gathers dust and I finally took the barrel off the Grendel and put a 6.8 on it.
as you can see I'm a believer..
