In addition to a laser rangefinding scope, the horizontal lines with yardage reference numbers provide accurate holdover to rapidly engage targets at distance. Yardage distances vary depending on the format of the reticle--whether the Rapid-Z 600 and Rapid-Z Varmint for use out to 600 yards, or the Rapid-Z 800/1000 for use out to 800 and 1000 yards, respectively. In addition to holdover points, the reticles have hold points for windage--the Diarange M does everything but shoot the bullet for you: Zeiss; $4200; (800) 441-3005; www.zeiss.com/sports