Scope
You said you checked your mount screws, and they are tight. However some base screw holes are blind holes, if your base screw is a thread or 2 too long, they will bottom out, and be tight to the feel, but not holding your base secure.
Thus the suggestion to put a small dab of epoxy under each base, too take up any slack. If the bases were not secure , it could be the root of your problem.
Pulled a lot of hair out before I finally caught on to this.
May or may not be your problem. Just a suggestion. Also if it’s a savage make sure the barrell nut has not come loose.
Hope you figure it out.
Spurly
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