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FWIW, for scope mounting, my first step is sticking a sheet of paper on the wall about 15yds away and using a level to draw a vertical line.
Unless you've an EFR riflescope that allows parallax adjustment down to 50', a straight line @ 15yds doesn't really allow one to level a scope due to parallax. It'll get you close, close enough for most hunting situations, but, not close enough based upon the OP's initial question.