It could be your jerking the trigger because of the mags recoil. I had a Savage 110 in 7mm mag and the tupperware stock was beating me to death on the bench. I rebarreled it to 30-06 and the recoil was still hard to take. I couldn't afford to replace the stock so decided to work with it. I replaced the thin factory recoil pad with a softer sorbethane one (cutting the stock down the thickness of the pad). I filled the hollow butt area (after digging out the expandable foam) with sand. I filled the hollows in the forearm with sand and epoxied over that to hold it in place. While doing all that I also bedded the action. I can now comfortably shoot 20 rounds from the bench w/o flinching and the rifle is not to heavy to carry hunting. The added weight actually makes the rifle more stable shooting off hand.
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