For every 1 inch of length, a 20 minute of angle slope will rise (or fall) .005818 inches. From your rear mounting hole, measure in inches out to the objective bell of your scope. Multiply that by .005818. Add that number to half the outside diameter of your objective bell in inches. Convert inches to millimeters and use that number for the calculation you use to determine the proper ring height. Sound confusing? It is. I have a good LGS that let's me try different rings before I buy.
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