Both good rounds. The ballistic coefficient on the 6.5 is incredible. Still supersonic at 600 meters! Only possible problem is linking for a MG. Think we’re probably at a point where some sort of disposable 200 round multi-stack mag could be developed.
And both the 6.5 and 6.8 work on the current lower receivers!
I agree. To get the most out of either rounds, I still suggest that the US military go to the Bull Pup style of weapon. it’s just right for urban warfare and still uses a long barrel to reach out and touch someone at 900 plus meters.