Wind drift bothered me for years. It makes no sense that it should be a function of "delay time".
Harold Vaughn in his book "accuracy Facts" finally explained it. ( A most excellent book)
The spinning bullet aligns itself with the vector result of it's velocity, and the wind vector velocity.
( zero angle of attact). The drag is now acting with a vector down wind, which is why drift is a function of
Ballistic coefficient. The fact that B.C. is defined in terms of velocity loss explains why
"drift varies with delay time".
It is not the wind blowing against the bullet as that would be a direct function of flight time.
And no Virginia, boat tail bullets do not " drift more due to increased length".
Take Care!
