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We're going to need more info to be able to help you out. Need Rifle make and caliber, scope base you intend to use and scope make/model.
Use Talley Ltwt aluminum and be done with it.Depending on barrel contour you might get away with Medium.Highs are only 1/10 inch higher. Totally skip a rail mount.(Unnecessary)
You don't lap Talley ring for 1, and they don't flex! Do you think the scope tube is made of steel?I worked with and for Leupold for 37 years and mounted Thousands of scopes.