After sending a half-dozen Hornady 212- grain ELD-x bullets downrange, I had the scope zeroed at 100 yards and I reset the dials, a process that involves loosening three screws on the elevation dial with the provided wrench, lifting the dial, and returning to the zero position. Following that, you can dial for elevation (counterclockwise) when shooting targets at long range, and when you’re finished, you can return to your original zero point by dialing down until the ZeroLock engages. That also means you can drop back to zero without ever looking at the optic. I was able to maintain my sight picture while adjusting the elevation knob down until the ZeroLock engaged. Once I was at zero, I depressed the button, dialed my elevation rise for 200 yards, and fired at targets at that distance.