I have a DPMS creedmoor and really enjoy it. I'm using the 140 gr Amax and SST's. Using the load data on the box of factory ammo has proven to be very accurate. Shot a .2 something group with it at 100 yards. To be honest that was the first 3 shots with the 140 gr reloads. I haven't shot a group with it since (not really my thing). I use it for shooting steel and have out to 600 yards. Thats about all the room I have on the farm I shoot at. I would say out to 600 it shoots less than half MOA easily.
I brought the 6.5 out to WY last fall and took 3 antelope with it. Shots from 150-250. 2 dropped in their tracks and 1 went maybe 30 yards or so. The SST's opened up nicely and were devastating on the antelope.
To sum it up basically the caliber is easy to load for, very accurate, low in recoil, and just plain fun to shoot!