In talking with guys in the industry that I know and trust very much, they are getting better performance out of their 16” 6.5CM than they do with 18”+ .308’s.
Better ballistics, better energy on target, and softer to shoot. My only 6.5CM gasser is my GAP-10 (for now), and it is a 22” Bartlein. Nor exactly a fair comparison. It will STOMP any .308 out past 1200yds.
I am VERY much looking at going to a 16” 6.5CM and shooting the 120-123’s up to the 140 ELD’s.
That should give me a 16” gasser that will go to 1000yds super sonic. My .308 takes 185 Berger’s to be super sonic at 1000.