This article covers it well A Scientific Basis For Evaluating Variable Crosswinds The idea is what is the difference in a 10 mph wind from 0 -500 yds at 1000 yds vs a 10mph from 500 - 1000yds at 1000 yds. Basic answer is the 0-500 10 mph causes twice as much drift as the 500 -1000 yd wind.
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