Re: auto range finding scope.........
My USO Sn-4 I had in A-Stan with the Circle Chevron had an auto range reticel in it. The width of each range line was 18"/shoulder width. Put the line that matches, bang. Since it got beat up really good(It was Soldier proof, Marine proof, but not quite Switchblade proof), I had it replaced with a JPJ1 reticle for the M855. Cool, auto ranging reticle. Each range line is, yup, 18"/shoulder width, line it up, bang. Best part about both those SN-4's? Nothing to rotate or do except zero it, then look through it at 4x