I read one of your previous posts. Is this the same scope that was on Point of Aim and then a few inches high?
I just about came unglued with a 308 Remington that would not group. It was my second rifle and I had a Leupold VX-2 on it. Always a 3-4 inch group and nothing would be consistent. The Point of Impact was all over. To the left, to the right, wandering.
Scope mounts changed, ammo changed, etc. But I just ASSUMED that the Leupold scope was in good condition. It tracked correctly. Clicking up, down, left, right.......what's to know.
Turned out that all of the crap and approximately 60 rounds of Federal, 80 rounds of Remington UMC, 20 rounds of ADI surplus were all in vain. The erector system insided the scope was broken. It still tracked, it was still in focus.......but it was moving thousandths of an inch at a time.
Point is that you need to remove the scope and put a spare or a loaner or a cheapo on it to test it. It sounds like you have tried remounting the scope rail. Take the rail back off, take the rings off. Put electrical tape between the rings and the scope (or address labels, whatever, just something to increase friction), try a new scope.