I did a search last night and didn't find much on rings and bases so I figured I would put my .02 cents in on Leupold. I had a set of Leupold rings and bases with the dovetailed front and their screw type rear. I went out to check my zero yesterday before my hunting trip this weekend. I could not get it to group. I got my rifle home to find that the slots on the rear ring where the screws on the base tighten down onto the ring were bent and distorted beyond belief. I dont know if it is because of the recoil (300 RUM) or if it was a manufacturing defect. I have a Mounting Solutions 1 piece picantinny base and Farrel rings on there way now. Ill let everyone know how they work once I get them here. For people looking into buying rings and bases, spend some extra money and save yourself some trouble. I will be switching everything I have to picantinny after this experience.