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Old November 10, 2012, 09:57 AM   #1
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Join Date: February 18, 2009
Location: SE Michigan
Posts: 459
How do I calculate the correct MOA drop?

I have a firearm with a Swarovski 3-9x36mm with the 4A reticle. The subtension at 9 power from the crosshair center down to the edge of the heavy line on the vertical is listed at 8.3 MOA. My POI at 100 yards is 1.5 MOA high.

If I want to use the edge of the heavy vertical (8.3 MOA) as a "BDC" holdover, do I subtract the 1.5 from 8.3 (6.8 MOA) and use that yardage distance or do I just use the distance indicated for the entire 8.3 MOA? Thanks.
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