I agree cleaning thouroghly would be a good first step, if that doesnt work try using moly i prefer oil to powder because it doest reduce velocity and doesnt act as a heat sink. i really dont think you shot out your barrel cuz ive put about 5,000 rounds through my .22 wmr and i clean with copper solvent and lube after every trip to the range so about every 500 rds it gets a thorough cleaning, preventative maintenence is as important, or even more than on your car. i havnt seen any decrease in accuracy at all


, take a page from the "what we learned in Vietnam" book, every gun needs cleaning