Good article drift. I was doing some studying in my old college vector equations. I finally started understanding. They were talking about a golf ball sliced or hooked, and the reason it slices or hooks is one side of the ball taking more friction (due to spin) than the other. But for it to work you need a force perpendicular to the spin. All I could think of in bullistics is only force is parrellel to the bullet which doens't do anything. But then it dawned on me gravity is the vector force perpendicular to the spin, not as strong as a golf club , but its there. I have shot some past 700 yards, and can't say I see it. But with 10" groups out there, its hard to tell what it is.