I am looking at getting Burris tactical 6 screw rings to mount a Night Force SHV 4-14X56mm scope on a Remington 700 with a Sendaro contour barrel and a 20 moa base. What height (Low, medium, high...) do I need? I read in a review that the low rings are about .250" from the top of the base to the bottom of the tube, mediums are .500" and the highs are .750". I would measure it my self but I don't have the base yet and I want to get the rings ordered. Thanks in advance.