Ny poor brain balks at converting mil dots into inches at whatever range. Maybe it works better in meters. I'm with Timbercruiser, i like the duplex. I use the space between the heavy wires as a 6 moa range finder. You can determine this by adjusting the power ring of a variable scope to bracket a 6" bull at 100 yardsand noting what power you are at. 6moa is of more value than the 18" circle of the P4, you can use it to determine the range of coyotes, antelope and elk as well as deer. The bottom heavy wire also make a good aiming point at long range.