I have the Dillon 900 that will load any shot size, but NOT buck shot or slugs. Which machine(s) should I consider to load 12g 00, 000, or slugs?

Gidday CJ....I hand load the shot mate.

With 00 Buck it is only nine pieces of shot so I carefully and neatly arrange them in the wad after I have seated it in the hull and crimp.

With slugs I do the same, although with the Plastic Reiffenhaauser style cases (Fiocchi Cheddite) I actually cut the petals off the wad before seating it...seat it, then push the slug (LEE lead slug) into the hull, then apply the crimp. I am trying different methods of crimping the slug too. I am trimming down the mouth of the hull so that it is just short enough to fold in over the top of the slug. See the pic below.

Cheers, Vince