I have a heavy profile fluted 18" barrel, SJC Titan comp up front, and overall a heavy rifle. Right at 12lbs unloaded. I also went with a MagPul PRS, and now a MagPul UBR stock to add weight to the back to balance the gun. I even run a Surefire 6PX light up front. I am running a low mass system with adjustable gas block. When you 1st pick it up, she seems heavy, but once you put it in your shoulder she feels much lighter. Barely even moves when I shoot it.
Weight does help soak up that recoil, but what seemed to make the biggest difference to me was the low mass system, and the comp. I like mine being heavy. Very stable on target, and I am big enough to still be able top swing it fast.