Bruce Pettet, CEO of Leupold, explains the custom dial system to Kevin Tate of Mossy Oak while on an elk hunt in Colorado. Leupold’s Custom Dial System® (CDS®) helps you easily compensate for bullet drop and make ultra-quick adjustments on the fly. With CDS, you can match your exact load, velocity, and conditions for unprecedented precision. Once you range your target, simply turn the dial to the correct position, aim dead on, and squeeze the trigger.