I bought a "Do-It" casing mold for making buckshot. They are the company that makes all the fishing weight moulds. I bought thier sling shoot pellet mould. It has 9 cavites on one side and 11 on the other. each side has about a 1 OZ pour they turn out some where between #1 & 0 for the 11 slot side, and 00 for the other. Ive used the 11 cavity side and poured a bunch using it to kill coyotes. I used wheel weight lead. I found it works well and goes pretty fast which i like.
I tried hard to find a #4 buck mould but could only find some expensive 2 slot moulds so i tried the slingshot mould for half the price... Worked well for me. I get 9 of the #1 in the shot cup of a 2 3/4 trap hull INSIDE of the wad. I have found that they stay together longer because they dont spin off the side of the barrel like traditional buckshot... That said I just bought some estate 00 buck at 35.5c a round at midway.