This thread piqued my interest. Buddy just put together a 6.5 Grendel. It shoots very well (a Bear Creek upper, of all things) with 123grn ELD Hornady Black Ammo, but he's not shot anything with it besides paper and steel out to 200.
I just ran the numbers on a berger 130 at 2350fps. Still running 1800fps at 400 yards. At sea level.
While I generally roll my eyes at threads (like this one) where the deer that was shot right through the heart got away, I will say that the 6.5 Grendel never really warmed my heart.
Necking the Grendel case down to .243 or .224, with todays bullets, seems to turn it into a different animal entirely. That'll be the way I'll roll if I ever build an AR in anything besides a .223.
