Had the same problem with a Savage 110 in 7mm-08 once. Tried 5 different scopes, 2 different sets of mounts and even went and bought a brand new Savage 7mm-08 with no changes. Realised the gun shop sold me 4 boxes of crappy ammo and sold the new gun for what I paid less the taxes, live and learn. The older 7mm-08 shot 3/4" groups after I bought good ammo.
I'm not saying that's what your problem is, in fact I think your forearm is most likely binding on the barrel. Take the forearm off and use a rest and try again. If it starts shooting good groups buy a small rubber o ring and slip it inbetween the forearm and screw.
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