That space between the wires should represent 18" at 100 yds. Weaver called it the Range-finder reticle. With a little work on targets at the range, you can set the upper cross wire for zero at a certain range, and use the lower "cross-hair" for a further distance, eg- 60 and 100 yds depending on the trajectory of your load. Best to work this out with targets, and get it memorized before hunting. The K 2.5's are nice little scopes.