I have been having trouble getting this gun to shoot Smokeless powder loads. It shoots fine with Black Powder and 535 gr. bullets ,but have tried 4 bullets from530 to 540 gr.and 5744,4198,sr4759 at 1100to1200 fps and none have shot anywhere close to the same group size. acouple people that shoot the same rifle at a match I was at last month said try 400 to480 gr. bullets.I wonder if any body else had this trouble,Thanks,Bill