I've had Extreme Weather M70s in .30-06 and .308. I tried many bullets in each rifle and both were fired considerably. Both guns were quite picky as to the bullets they would shoot well. The best I can say is these rifles would group 1.5" (or slightly less) for five-shot groups at 100 yards. (Three-shot "Internet" groups were considerably smaller.) To confirm, I fired five, five-shot groups with each gun and averaged them. This was using the most accurate bullet for each. Plenty adequate for most hunting, but many of us expect better from a bolt-action rifle.
My guns weren't tampered with; they were used straight out-of-the box. Both had 6x Leupold fixed power scopes.