ALWAYS re-set a factory scope and check stock screws. 3rd thing they taught us in Gunsmith School. Locktite the base screws and even a tad under the base, but NEVER Loctite rings, but tighten them alternately same as changing a car tire. Stock screws should be tightened and nicked with a prick punch so a quick visual tells if they have moved. Front screw tick at 12 oclock (towards muzzle) and rear screw nicks at 6 oclock.Do not trust the tightness of the stock screws or scope base screws as they come from Ruger. The factory bases were finger tight and both stock screws were the same.