RODENTRIDDER, Yeh how about some more details about your gun, sites and load. What scope are you using? Aside from the o-ring trick have you done anything else to the gun like trigger work, polished chambrer or bore? Did you break the barrel in in any special way? Are you getting those 3/8" groups at a distance of two football fields hand held or using a gun vise? Are these 3 shot, 5 shot or 10 shot groups? Are you sure your not blowing smoke up our hind ends?