I got the 6.8 shooting some very great groups, I do believe it will stay sub MOA at distance 400 yards plus. the 18" SPR Shilen match barrel with ammo up to 140 grain VLG's. before with other barrels only the 85 grain Barnes would stay MOA to 400 yards.
built the 6.5 Grendel this year. and love it. I am so glad that ammo for readily available now the 6.5 is something I wanted for awhile. the wife out shot me with one at 650 yards about 5 years ago. it was a side match at the 2011 pro/am I believe. the 6.5 has a 18" JP lightweight barrel. it has the F class bipod. both have a Vortex 4 x 16, the 6.8 has the HS, the 6,5 has a PST. I was wanting the JP tube for it but I got the Samson for $150. the .6.5 still has a little to more recoil that I would like. but if I adjusted the gas block with 123 hornady (2532 fps), it would not run the PPU (2510) or the wolf gold 2493 fps. so right now it's opened up. I also had 100 grain wolf steel case that I got for $7 a box that I thought I could use here at the house at 95 yards. but could not even hit a golf ball with a box and a half of that junk.
the PPU's 1 shot. 1 airborne golf ball. and on that note hornady had the best groups, PPU next, then the gold.
some u may notice the scope mount on the 6.5 is on backwards. some of u know I broke my neck 37 months and 4 days ago so I can not lean into the rifle.