skippy:
Have you checked you base and rings to make sure that they are secure?
Can you shoot better groups with other weapons ( not meaning to be an ass but I have a buddy that I hun with that can't shoot <moa with anything he owns, I can shoot 1/2" with his 22-250 and his loads) Man does it piss him off.
Dont give up....But you may want to have a gunsmith check it for you.