Check and make sure you don't have to long of screws holding your scope mounts on if you do you will have to get different screws or shorten them. A very tiny amount of play there will make any gun shoot all over. Check all mounting points including the action attaching. If you bought it used check the size of the touch hole it must be less than 40 thousands in size and round if it is flame cut to one side that also can cause your problem. Use a torque wrench and set the stock to action screws to 28 inch pounds uneven or to much or to little pressure affects accuracy. And last but not least try a different powder, I have come across several guns that just won't shoot old crudring 777 accurate.