As per Ridgereaper's problem - my guess it was a Leupold internal spring problem, like weak or no spring force to return erector tube to zero position. I have experienced the same. I like Burris Sig rings that enable me to position 200 yard zero from 20% of bottom of elevation range; adding 25 moa or 9 mils gets on real close (+-) to 1,000 but elevation is not cranked up to near max allowing about 35% remaining elevation range with 60 MOA scope, more with 80 moa scope. Avoid extreme up (out) elevation & right (out) windage settings. If it doesn not kick too bad & it needs to be lugged around aluminum is OK for bases. Light scopes handle recoil better. Burris Sig Zee rings don't weigh very much. I am looking at Sightron scopes now in regard to the spring problem. I have sent many Leupold scopes back for warranty claims that have failed, like 3-5 foot groups at 100.
Shooting long range rodents in bad light requires good glass.