In an effort to free the highjacked thread, I offer this example. Please note first that the factors that go into wind drift are VERY complex and are not always subject to known mathematical formulas. I say known, because there is a mathematical formula for everything, we just dont always have either the right variables or havent yet figured out how to incorporate certain variables into an equasion. In other words, accurate drift can be always be figured by using math, just not with always with the math we use at this stage in our understanding. So sometimes, in certain circumstances, a ballistic calculator wont give us a perfect figure, however they can be darn close much of the time. Just for kicks, look at the example below. Bullet #1: BC of .500 at 3000 FPS at 1K drifts 95.1" with a TOF of 1.5297 sec. Bullet #2: BC of .400 at 3400 FPS at 1K drifts 110.7" with less of a TOF (1.4933) Would you say that BC has an effect on wind drift??