Ballistic Plex
Precision rangefinders, specialized rifles and more accurate ammunition have removed some of the variables in long-range shooting. However, with a basic crosshair reticle, calculating hold-over is a mix of art, science and just plain luck.
Which is exactly why Burris developed the Ballistic Plex reticle. The key is the copyrighted lower vertical crosshair. With most common hunting cartridges, a shooter can use the reticle to compensate for bullet drop and aim dead-on at targets from 100 to 500 yards out. The need for hold-over guesstimation is eliminated.
Using it is simple. Start by sighting-in your rifle at 100 or 200 yards at your scope’s highest magnification. Then, once you determine the distance to your target, select the appropriate ballistic line. Add slight hold-over or hold-under for in-between yardages and take the shot.
Some additional info on the Ballistic Plex
http://www.burrisoptics.com/pdf/BPlxlabl.pdf