Okay, thanks for the post. But that's 6.8mm. In this thread we are interested in the 6.5 Grendel.
It looks like Arne Brennen is also selling uppers too. He is the guy who initially got the 6.5 working in the AR. Then talked to Bill Alexander. I can't see how I can go wrong going straight to original guy that built this monster.
His prices look reasonable.
6.5 Grendel uppers start at $875
.50 Beowulf uppers start at $655
http://www.competitionshootingsports.com/
Okay, here is what I am thinking; It looks like the Grendel was designed for 24" barrels. Long range shooting, so who cares. I'm thinking about getting the 6.5 in 24", and also a .50 Beowulf at the same time. It looks like they should both drop right on my lower. The Beowulf's have to have the the mag tweaked. Which granted 20 and 30 rounders are cheap enough I guess. So a little over $1500 and I can increase the potency on my AR from 0-1000 yards. This is my initial knee-jerk reaction to finding out about the 6.5.
I'm still not totally convinced yet, as the .300 Whisper also has a lot of potential. What I need to decide is if I'll ever have some fun going sub-sonic. If so I could drop the 458SOCOM/50Beowulf idea and get the 300 instead. As I consider 300Whisper, 458 and .50Beo to all be 200 yard or less cartridges.
But there is the versatility of taking the .300 supersonic though that just keeps nagging at me. It's still coasting a 240gr slug around 1200fps at 400 yards. And it uses .221 brass. I am pretty sure the only internals changed are the barrel, and adding an adjustable gas tube.
I don't see the 6.8 in my future, it's fine if I didn't already have an AR, and wanted some sort of middle of the road round.