I've got a 3-9x42 Redfield Widefield Illuminator w/AccuTrac. To use it, you bracket the animal between the two upper stadia and then read the distance in the lower right hand corner. Then, you turn the elevation turret to the correct yardage and fire. The scope eliminates holdover. As was mentioned, there are several dials, ie., a,b and c which will correspond to various calibers. There was also a blank dial for wildcat/handloads. MI VHNTR
