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Check pinch points for stock / barrel contact….any irregular torque on the forend would account for what you are experiencing…if you place the rifle differently or pressure the front of the stock in any way on the front bag differently this will happen and not uncommon. The rifle may also double group alot…
If you have no pinch points causing the problem then it could be other things…but if its capable of good groups and shooting good groups on occasion it usually related to shooter error or stock related problems.
If is a new rifle I'd clean before shooting each ammo type…especially if you are mixing in copper solids…
