Just got my hands on a new rifle and scope. A 257 Weatherby ultra-light with 3-9 Leupold scope. It is mounted with Warn bases and rings. Took it out today for initial sight-in and had problems with the elevation. Windage adjustment dialed in fine, but could never get the elevation closer than 10 inches low at 25 yards. I would hate to shim the rear base, but does anyone have other ideas?