My dad has a Mossberg 100 ATR in 30-06 topped with a Nikon Pro Staff 3x9x40 with the BDC reticle. Now,ive tried to sight this rifle in,the closest i can get it to hit is 3'' low & 3'' to the left at 75 yards,and if you try to adjust the scope to hit the bullseye it will not move the point of impact. The stock on the very end of the stock the stock is like its warped to the right causing pressure to the barrel. I know its not from me being a bad shot cause i can drive tacks with my Rem. 700 in 30-06. HELP!!!!