Features of this Data Book: 1) Has more than twice the number of plotting pages as most others. 2) Plotting pages are larger. 3) Scoring rings are proportional to the target. 4) Grid lines are from the "Amended" rule. 5) Eight sets of wind charts. 6) "Wind speed estimating guide". 7) Chart explaining the rapid fire "Nine-yes, Nine-no" problems. 8) Rapid fire pages have twin bulls for the 1st & 2nd strings. 9) Pages for the "Gun round count" that helps a gunsmith determine problems. 10) This data book was designed for "Simplicity". Soft Bound.