Do you see smoke from or in the barrel after a shot? Do you smell smoke? If so, you may be having an accuracy problem from dieseling. Lubes in front of the piston seal will cause this.
Also, check the crown. It's the chamfer where the end of the rifling meets the end of the barrel. I've seen a lot of crown issues with the 350.
A little blue LocTite on clean stock and trigger screws will prevent looseness.
Those are a few things I would look at.
Rob
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