The best method of successfully reading wind in the field is to shoot at extended ranges in the wind a lot... Infact I don't think there is any other option.
Target shooting with flags all the way to the target is another matter but I dont think that's what your looking to do is it?
I use the ballistics calc bullet flight version3
Once you've decided on an average wind speed and direction to the target simply punch it in then apply the solution and pull the trigger.
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