The Museum of the Fur Trade has an original shotmaker, a plate of perforated sheet iron sandwiched into a piece of wood as a handle. I've made a copy, and it works after a fashion. The shot is rather teardrop shaped. If dropped high enough, the shot is more round, but with the dimple typical of Rupert shot (invented apparently by Prince Rupert, cousin of King Charles II, and founder of the HBC). By the way, Rudolf Kurz wrote about making shot at Ft. Union, when nothing else was available. Strips of lead were cubed up, the rolled about in a frying pan with ashes to round them. One of the engages' made his round by chewing!
Making your own shot, while probably not cost effective, is fun and one of those frontier skills that are good to know. I can't recommend the chewing method, however.
Rod