ATTENTION all who use MOA or MIL reticles for back up ranging.
To all who use MOA or MIL reticles for back up ranging purposes.
I was updating some software this morning and came accross some discrepancies. I am sure some of you guys know this. I am also sure many do not.
The standard for mil ranging is target size in inches * 27.778 / Mil value = range in yards.
The standard for MOA ranging (according to Nightforce and their most recent reticle booklet) is target size in inches / MOA value * 100 = range in yards.
This standard is not 100% accurate due to the inch/MOA conversion.
An example is an 18" target that takes up exactly 1 mil = 500 yards.
The same target taking up 3.44 MOA (same as one mil) = 523 yards using the 100 as a constant.
The same formula except using 95.5 (which is 100 / 1.047) for a constant instead of 100 gets you to 500 yards.
I talked with Ken at NF this morning and he confirmed that 95.5 was in fact the most accurate number to use. They use 100 in their information booklet to "simplify" the formula for the user.
Hope that helps somebody. Who knows, maybe I am the last one to figure this out!
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Last edited by Michael Eichele; 04-20-2009 at 01:54 PM..