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If you click on the "Fire" button (bottom right), you get bullet holes in the red Impact circle.
The "Clear" (bottom left) button removes the bulletholes. The "Impact" box turns the Impact circle on and off.
Change the Wind:
Slide the right hand slider on the simulator to see what wind speed does to the impact point. The red flag moves too.
Change the Range:
Slide the left hand slider on the simulator to change the range to the target.
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