Thanks to those who gave suggestions. I moved the rear screws and got perfect adjustment for windage, first using a bore scope, then fine tuning. I have another problem that I could use some help with. What is the best way to shoot these rifles off the bench? Should the fore end be rested directly on the front sandbag as is SOP with non-full stocked rifles, or should the hand be placed under the fore end and then rested on the bag, like with a double? These rifles are much lighter than I am used to shooting, and while I get excellent groups with both 140 Woodleighs and 155 grain Lapuas at 50 yards, my results at 100 yards are inconsistent. Any suggestions are greatly appreciated.