Use your optics to read mirage. This is the affect of heat distorting the light as viewed through your scope. Similar to seating the heat rise off an asphalt road in the summer.
You can adjust your focus point about 2/3rds of the way to your target and see the mirage and the effects of the wind on it. Tons of information on reading mirage, but the best advice I can give you is practice reading the mirage and notice the affect it has on your bullet impact on your target. You will see the mirage move left to right,right to left, boil straight up (no wind), or at angles to either side. Each represents a varying degree of wind condition. With practice you can estimate windage fairly well based off of mirage
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