If your 6.5 Creedmoor is "all over the place" I would first recommend dismounting te scope and base and reinstalling - or upgrading. My M11 had the "factory mounted scope" and the base screws were loose from the factory. Never would have held a zero.

I went with all steel Warne. The two-piece OEM bases were already steel . . . just loose. That's one place a hair more weight may be worth it. The rings were discount-store aluminum. Buh-bye.