As Len stated, pg. 3 #18, and as by now you know is publisher of this site. You generalized 4000 feet, as basically being the same. Which it is not, for example, and this is taken from JBL ballistics, for a 308 nab, BC .507. Which I think we could say is used for long range, my high school buddy shot national champ and won at 15 , 1000 yrds with this , for age group.4000 ft.=345 in drop with 200 yrd zero, 8000 ft=314 in drop with 200 yrd zero. Difference 31'', means miss, 1/2 the difference, general for 6000 still 15", hold in center of deer, still equals miss. This is with nothing said regarding the angle of the shot.Not trying to pick on bdc dial system, I have several, just trying to be accurate.