I would recommend you go to MilCun Marksmanship Complex web site. http://www3.sympatico.ca/milcun/
Look under the What's New tab.
And take a look at Linda's book called "The Wind Book".
Linda has written many articles for Precision Shooting and publishes a good newsletter called Coach Net.
One other note - The slower a .22 caliber bullet is flying the LESS it will drift. I know this is just the opposite of all logic and what most people think, but it is true. There have a few articles about it the best one was in Shooting News in September 1998. And you wondered why Eley was putting the velocity on the end of the box?
Good Shooting, Curt Ingersoll