Just noticed all the comments on the Leupold scopes and problems. Anything can fail, but if anyone is having multiple Leupold failures I would strongly suggest going to a new scope mount system. The general con census as noted here is that Leupold's are super reliable. One of their Warranty Facilities, Premier Reticle, simply suggests having any Leupold checked out before any "big trip" as a precautionary measure.
Again, it sounds like the mounting system is giving problems. I have also heard (big emphasis on heard) that mercury recoil reducers can generate stresses in reverse to those most scopes are designed to handle. This is much like high power air guns.
In any case, I stand behind my comments about Leupold in the VariX-III family as the best choice for the big boomers. Permier Reticle would surely by phone have comments on the newer lines, and their comments to me a few years back was the VariX-II line was even more durable in the Erector area.

Safe Hunting,
Clint