I have a 6.5x284 Norma Carbon Six barrel on a savage action and in a MDT ESS chassis. The barrel is fantastic, cools really well, shoots amazingly well and is fairly consistent in temp swings as well. My cold bore five shot groups are sub 1/2 MOA and once the barrel is warm they settle in around 1/4 MOA. I was doing some shooting at 500 yds and I was getting consistent 5 shot groups around 2-3" I know it can do better but I think I have to develop my load a little better as well (still a relatively new gun).
From my experience with this one I wouldn't hesitate to get another one.