Thanks to everyone for their advice . My 18" inch groups have shrunk to 4" but I had to stoke her all the way up to 110 grains of 2f. Started today at 90 grains going up in 5 grain increments. Each 5 shot group got progressively smaller. Ran out of wads but the gun seems to like more powder for sure. So 110 grains 2f, unlubed fiber wad, lubed .015 patch and .600 ball.