Howdy all. I was wondering if there is a link or such for using the Leupold duplex reticle as a rangefinding aid. You know,how much does it bracket at various ranges on what setting. I used to cut 18" cardboard squares in the old days and do R&D in the field,but that was a long time ago with Weaver and Bushnell scopes. Anyone have a lead? Thanks a bunch,R.J.