I was told that the difference between travel time at muzzle velocity and true travel time, multiplied by the speed of the cross wind, will give you the drift.
Let's say the MV is 3000fps. In a vacuum, you could shoot 1000 yards in a second. Now assume that the bullet really takes 1.3 seconds to get there, and the wind is blowing 90 degrees at 200 inches per second. Your shot is going to be displaced by 200x0.3, or 60 inches.
If there is a 70 gr bullet listed for 1 in 12 or faster, I'd like to know what MV is suitable for one in 12 twist. It might be something that only works well in a 220 Swift. When I bought a box of 7mm A-max, I found a minimum twist rate (think it was 8") printed on the box. I called Hornady, and talked to a guy who told me it would work fine at 3000fps in a 10" twist barrel, 2800 would be iffy, and 2600=forget it. Looks like I may need to ream my barrel to 280 AI if I want to use these bullets in my Handi.