The SHEPHERD 6-18x40 V1 Dual Reticle System Rifle Scope (618-V1) has such magnificent features as one shot zeroing in, visual confirmation of windage and elevation, instant range finding and bullet drop compensation, instant visual verification of the original zero, and so on. You will always find the brightest light transmission and the sharpest resolution in optics with the Shepherd scope. The model 618-V1 has 18" range-finding circles for deer and military silhouettes. Please note that circles can be adjusted up or down to accomodate faster or slower loads. Shepherd Rifle Scope gives you the best of both worlds with the drawbacks of neither. Sheperd uses the front focal plane location for rangefinding and bullet drop compensating circles. This gives Shepperd Scope the German dependability and, when zoomed, the circles do not block the targets but instead frame them and give you instant target engagement on any power. Then put the cross hair in the rearfocal plane (where the Americans do) in order to get the benefits of a nonmagnifying reticle. This patented Dual Reticle System lets each reticle monitor the other and thus allows for: one shot zeroing in, "at a glance" verification of the original zero, and visual confirmation of windage and elevation adjustments before you shoot. The Shepherd is truly the most reliable of all and the only one to tell you if something is out of zero before you shoot.