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Old November 25, 2012, 05:36 PM   #26
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,408
I use a Dwyer wind gauge to read the wind speed at the firing line. Cheap and accurate. Then use a constant for the bullet and its muzzle velocity to calculate corrections based on wind speed and directions.

Here's a table showing the wind speeds above the line of sight:



If you look at the trajectory path of a bullet, it spends only about 25% of its time at the top of its arc where wind speed's the fastest. 50% of its time in the middle wind speed range and about 25% in the lowest speed range.

The following's a table showing how much the wind has at different ranges for a given crosswind across the entire trajectory:

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