I got out and shot the Barrett yesterday and I have to say I think the combination is really going to work for me. I was a little nervous that the recoil out of the ~5lb rifle would be unpleasant, and I would be back where I started, but the recoil of the 6.5CM was significantly less than my much heavier .308 or even heavier still 30-06.
I didn't get to shoot it a ton, the thin barrel profile got hot quick, and I had my 4 year old with me so I had to keep him entertained. We alternated, I would shoot a group, he would shoot 10 shots through his 22. I shot 5 different factory loads, but hesitate to publish the results due to my not particularly impressive shooting (don't blame the rifle, blame the shooter). I also forgot to bring a measuring tape so the group sizes are not accurate to the thousandth like many people post with calipers, just what i could see on the grid paper:
All groups three shots, 105 yards.
-Federal Power Shok 140gr SP: 1.5-2". used to sight in and shoot the first group. Nothing impressive, shot about 1.5-2" 3 shot group (read these groups with a grain of salt. I am not great at shooting for groups, and had a kid yappin in my ear the whole time).
-Federal Nontypical whitetail - 140gr SP: 3 shot group, 1.5-2" again. hot barrel.
-Federal Fusion, 140 gr - 3 shot group, right at 1" with two in the same hole. Looking good.... barrel pretty hot
-Hornady American Whitetail, 129gr - 2" 3 shot group, barrel getting a little too hot...
-Winchester deer season XP. 125 gr - right around 1" shots spread, all equal distance from each other. POI about 1" low, my target and shooting bench were both not level, which I think impacted the group (not holding the rifle consistently vertical relative to the target).
So after letting the barrel cool for ~20 minutes, I picked the best of the 3 shot groups and after convincing my son to be quiet for a minute, shot one quick 5 shot group:
Federal Fusion 140 gr SP: 2" overall group size. 4 of the 5 shots touching, and one a little over an inch away. VERY HAPPY!
My takeaway: This rifle will shoot. It is also very pleasant to shoot. I think the stock and the recoil pad to a lot to tame the recoil, but the difference in the .308 and 6.5CM was very obvious (which I was very excited about). I will definitely have to plan ahead for barrel cooling time if I am comparing loads again, because none of the shots I took after sighting in were "cold bore" or even close. I will pick up a few more boxes of fusion for now and get ready for the upcoming deer season.