ALso while your looking into this you will for sure want to go to the link below and do a bit of downloading from the articles to the notes, and especially the book, "From Ingot to Target"
The Cast Bullet / Hunting Articles Of Glen E. Fryxell
If that don't answer some of your questions and give yo ua notebook full of more to ask about then your not much going to like getting into casting. LOL
Also you didn't mention which bullets in particular your shooting. Are they round nosed, SWC's, or what. THat will hep point you at a decent product ion mold that will allow you to spend more time loading than pouring.
Hope this helps. One last thing, if you thought getting into loading your own bullets was a hoot, you ain't seen nothin yet. Consider yourself warned...