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I under stand that but it would only mean an 80 dollar knob for different elevations,
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Why spend the 80 bucks when you can make a chart from a free ballistics program.Print it out on a half cent piece of paper and cover it with 3 cents of laminating sheets
...You can do it the way you want.....I'm just trying to tell you what works and what does'nt....
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How much difference does barometric pressure make?
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Alone not much.Add it into a 20 degree temp difference and a few 1000 feet in eleavation and You just missed...Its not bad until you get out past 700 yards or so.....Just trying to help