That's always the first thing I usually check too Thom.

But I screwed up big time last Saturday helping a buddy figure out grouping problems with his Knight MK-85 using T7 and Powerbelts. We put about twenty bullets down range with various loads before we realized that the front scope base was loose. After fixing that we were still having problems, though to a lesser extent. He was sure the scope was faulty. But after convincing him to try dropping the powder charge (he didn't want to go below 90 grains) we hit the magic load with 70 grains.

I don't fault you for trying the Leupold "just in case" - that's what I'd do too. I hope the scope is the source of the problem, but still bet it's not.