ORIGINAL: bigcountry
Signs of a problem. Leupold will warranty it. Yes you can overtighten but usually won't show what you got.
Every long range scope I get, I do a bow tests, which basically is shooting and moving 4-6 MOA up, over, down, and back to make a box to see if it comes back to zero.
Yes that is the square drill (
http://www.gameandfishnetwork.com/download/T100-SquareDrill.pdf). I do that with any scope I mount.