Huntdoc,
The wind can blow fairly brisk anytime of year in KS. I've hunted first week of Nov for the past six years. I've seen 10-15 to 30-40 MPH winds. I shoot G5 Strikers and and have seen as much as 6 inch movement from 30 yards. Best advice, shoot some practice shots everyday. Try to practice a few days before in high winds at home if possible. You more than likely will have to feel you way through it. I am not aware of any calculation that will help with such conditions, simply practice in them when the opportunity arises. It's not overwhelming as you may think. Best of luck.