Jim Owens Data Book, by M/SGT James R. Owens. Some of the features are Eight Sets of Wind Charts, A Wind Speed Estimating Guide, More than twice the number of pages, Larger plotting areas, All Scoring rings are Proportional, Jim Owens “Amended” grid lines, Twin plotting bulls for rapid fire, A “Gun Round Count” page, A Checklist for items to bring to the range, A chart detailing the scores needed for each classification, A chart giving the dimensions of the scoring rings, A chart describing the scoring system, A guide for normal come-ups from 100 to 1,000 yards in 100-yard increments, A chart explaining the “9-Yes, 9-No” problems. This data book is more than a $60.00 value.