Once you start to shooting further out, you are going to be dealing with the wind. Assuming you have mastered all the fundamentals of shooting, this is the one thing that is the most difficult to deal with. "The Wind Book for Rifle Shooters" by Miller and Cunningham (available at Amazon.ca) is a great book packed with all sorts of practical information on how to read mirage, wind flags and natural features and the effects of wind angle on your shot. Some of the best information is contained in the tables at the back on caliber specific wind deflection charts. While this book is most useful for F Class shooters, anyone interested in improving their wind reading skills will benefit by reading this book. I highly recommend this book.