I had a similar problem with my nephews Ruger 30-06 with a Vortex Crossfire (Cabelas Package). The scope was sliding forwards through the rings. Very very little but just enough to make the group opening up. Starting to get obvious after 8-9shots. The screws were tight and rechecked with a torque screw. I had to put marker on the scope to see the movement.
So far you have ruled out the scope. If you think the gun is OK, is time to check the rings.
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