"In the process, being a scientific sort of person, I ended up becoming fascinated with exterior ballistics, so I included it in the early classroom sections. It also didn't seem possible to teach use of the reticle without understanding exterior ballistics. I hadn't shot long range myself until I started working on the simulation. To test everything I had learned, I went out to a range, calculated the distance on a target that was, if I remember, 900 yards away. I hit it on the second shot, and the first was not far off. The first version only used the .308 system and was very simple. It was so popular I developed version 2 with more calibers and stages. The current version was developed to incorporate the mil turret system, and I added three more calibers as well as more challenging stages," he added.