 These so-called "balloon guns" are sometimes made as a substitute to ordinary slingshot, and are often used to create the "shotgun" effect with multiple projectiles fired at once.The world record for the most energetic shot with a handheld slingshot was 135 Joules (99.57 Foot-pounds).It was shot with a forward extended slingshot, also known as a "starship", which achieves more power by increasing draw length.