WAM,

I have mentioned spin-drift here and there in my writings, but for most hunters, spin-drift is pretty much adjusted for for when checking clicks and adjusting zero etc. at longer ranges.

If you really want to read up on it, Bryan Litz's writings are a good resource: www.appliedballisticsllc.com.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck