Like Ruger, several riflemakers now equip their guns with Weaver-style bases. But sometimes they neglect to tighten them. Loose bases can have you shooting all over the place, and you'll think it's the rifle or the scope. Take the bases off the rifle and degrease the screws and the screw holes with lighter fluid. Then reinstall, and tighten the screws until blood seeps from under your fingernails.