Lead ball moulds made for olde tyme musket muzzle loaders, have long been a thing that catapult hunters love. In the past, you could use the old kind of mould but that meant a large sprue to trim. These new ProMould designs are lighter, better and whilst absolutely NOT made to create balls for any kind of firearm, they are the most precise ball you can make for the effort. Made JUST for catapults. A well placed lead ball is entirely able to fit the legal description of a humane hunting method.