Make sure the front scope base screw didn't bottom out early against the barrel threads and check to make sure rings and bases are tight with no wiggle. (Just because that front base screw is tight doesn't mean it didn't bottom out early)
Shoot off of some good bags with the forearm on the bags not the barrel and pull the rifle down into the bags and your shoulder snugly when firing.
Have you tried torque tuning the action to the stock? when done with a decent load it can make a pretty big difference.
http://www.accurateshooter.com/techn...torque-tuning/
Maybe a few good places to start. Good luck.
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