Jim Owens (M/Sgt USMC Ret.) has two data books for the highpower shooter and the long range shooter. Both books were designed by Jim Owens who has coached, and trained hundreds of competitors . Each book is constructed with a stiff cover and section color paper. Wind charts for various cartridges and bullet weights are included.
The Highpower book, which is the standard data book for across the course shooters, has 52 plot sheets for each of the 200, 300 and 600 positions.The rapid fire pages have two plot targets (one for each string of 10). Information on conditions, zeros, wind, light, sight settings, etc. can be recorded on each page. The offhand pages have places to record each shot, call, windage, elevation, etc.
The Long Range Data Book is designed for the shooter who primarily shoots 600 yards and out. It has 108 plot sheets for 600 yard targets and 108 plot sheets for Long Range Targets (800 / 900 / 1000 yards).
Sinclair, Issue:5B, Page:259