Just hitting the target isn’t enough though. To score, a shooter must knock the witness cap from the propeller, and it must land within a fence 21 meters beyond the launchers, so you can’t take to long to fire.
"The disk will pick up every little breath of wind and change direction, jink left, juke up and down, flutter, and dive," says Michael B. Higgins in the story. He runs the Long Straw Range shooting preserve in North Texas and serves as the president of the U.S. Helice Association, the story says. "It is very, very fast. You have a second to make the shot."