Use the Burris Posalign rings, and rotate the inserts. The link is provided.
Adjust the scope to half way above the center of it's travel and try a +/- .020 insert in each ring, and rotate the rear one to the minus position.
(I think I got that right) You can get .040 of correction without a special base that way.
These rings are Excellent for 1,000 yard shooters, and inserts are cheaper than tapered bases.
The bottom of the page gives you all the info you need.
Let us know how it goes.
HM