I agree with the use of extension rings, but have only used the Angle-Loc's by Millett which are a great help where they're needed. They are very strong when Loc-Tite'd into place.
BUT, I would not use a Leupold base, and would go back to those Weavers, or one of the other brandss, to get a set of two-piece bases that can be turned around in order to move the cut out/ top notches forward or backward -- where the notches are not cut into the very center of the bases. The use of such bases allows for some rearward movement of the scope, as does the use of the extension rings.
Don't be afraid to use a hacksaw on a base where it may be overhanging the bolt when installed. I've never had to do it, but would do it to get the base installed the way I wanted it, to get more eye relief.
I know one coworker who has had great service from Leupold with broken parts......but who wants that? I want the Milletts that I've already dealt with, which do not come with Broken parts! :eek:
Good luck.
SS'