It would be a pretty drastic step that will be a pain to clean up if it doesn't work, but there's one method I've used that has never failed.
First, degrease the top of the receiver and bottom of the scope base. Then put a couple drops of blue #242 Loctite between the bottom of the base and the action, as well as on the screws. It doesn't take much, just a couple drops, and it's best to tape off the action and have a rag ready to clean up any that gets squished out.
For the scope, again degrease the inside of the rings and the scope tube, place one drop of blue #242 Loctite in each ring half. Again, be ready to wipe up what squeezes out.
Like I said, this can be a big pain in the rear-end to clean up later (but it can be done), but it should work if anything will.
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