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Old January 3, 2013, 06:30 PM   #14
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Join Date: August 25, 2008
Location: 1B ID
Posts: 10,186
That’s a lot to keep up with! Sitting at a bench with a calculator and all day to shoot, using a multiplier would probably work. Otherwise, you're better off shooting at high power (if you can) or changing mag after ranging.
All you need are the subtensions of the reticle at the magnification settings that you're interested in and the ballistics of the load, to calculate for 'hold over' points. It only takes a couple minutes (if that) to do the math for multiple ranges.

If you want to use it as a 'ranging' reticle, you need: subtensions at the desired magnification(s), and the distances you care about.
It only takes about 2 minutes to calculate some reference dimensions, maybe a little more for complicated reticles.
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