Reticle Ranging Scale:

This reticle has many useful ranging & framing reference information in it.
When you use this reticle to frame and estimate the range you need to turn 
the magnification to 6X The horizontal line has 1 MiL per small scale The O.Dof the big circleis 10 MiL.
The small circle O.D. is 5 MiL.The center dot is1 MOA.
The center dot and the small circle can be illuminated as needed.
The height of each the 1Mil short bar on the horizontal line is to reference 0.5 MiL.
The height of each the 5 MiL medium bar on the horizontal line is to reference 1 MiL.
The height of each the 10 MiL high bar on the horizontal line is to reference 2 MiL.
The vertical line is calibrated with the hold over value to compensate the drop from 200 to 900 meters. 
You can use the hold over value for more calibers, 
which have the similar trajectory in this range especially. 223 and 308 up to 900 meters.