To be honest, I haven't rigorously tested the calculations in the field yet. I don't have a anemometer. Have been looking for one on and off.
Rather I just eyeball the wind indicators, flags, grass, etc, on range to come up with a estimate on cross wind. I refer to the weather report of the day too. Then I plug it in the equation to come up with windage dope. Pick a point on the berm and fire a couple of rounds. Measure the windage of the poi with the scope reticle. There are always errors. 2 or 3 moa is common. Then I dial it in and start "firing for effect", adding in small hold over for each round as it goes.
-TL
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