Performing some thread necromancy here.
I picked up a Remington 700 AAC-SD this winter and dropped it into a Bell & Carlson stock. I've only put 50 rounds through it so far, but it's shaping up to be a sub-MOA rifle with the loads I've tried so far. I need to track down some heavier bullets to take advantage of the fast twist (1:10) and see if that will shrink my groups some more, but right now it's hovering between .75 and 1 MOA from a bench. I'm not a very good bench shooter, so I'm sure someone more skilled could do better. I'm much more interested in shooting from positions, so once I get a good load worked up I want to do some long range shooting from prone.
Anyway, while I was breaking in the barrel I shot it without the can, but I bought this specific model because the 20" heavy barrel is threaded for a suppressor. Last weekend I stuck the can on and headed to the range. I saw no change in accuracy, but the point of impact shifted down 4 MOA due to the extra weight on the end of the barrel. The big change was in how pleasant the rifle was to shoot. This is a heavy rifle with a thick recoil pad, so recoil was mild to begin with. Now it's a pussycat. The reduction in noise was the best part. I wouldn't consider it hearing safe, but it made shooting it much more enjoyable. I was shooting under a tin roof and an unsupressed 20" .308 is LOUD. This got rid of all the muzzle blast and turned the "boom" into a loud "crack". I think I need to build another 308 can for my Blackout so this one can stay on the .308. I purposely overbuilt this one so it would hold up to .308, so I could build a dedicated .300 BLK can much lighter.