I just bought a slingshot pellet mold from Zeiners Bass Shop
I just bought a Do-it slingshot pellet mold from Zeiners Bass Shop. Do-it makes mostly fishing weight molds. It came in just a couple of days and it looks pretty good. It makes 9 at a time that are around 0000 buckshot and and eleven at a time that are a little under 0 buckshot. They cost about $30 with shipping. I haven't got a chance to try it out yet.
http://www.zeiners.com/doit/slingshotpellet.html
I have a couple of lee double cavity molds that make approximately the same size which have sprue plates. The Do-it molds require you to cut off the excess lead. I haven't tried the lee molds out yet either. I bought them at Cabellas.