Guys,
From a PM about the plaster bullet mold, some more details.
1. Get a ball of the proper size, it may be of any material; plastic, wood, metal.
2. Make a "hamburger patty" shaped disk of putty, clay, play dough, about 2 inch thick.
3. Press the ball into the disk until exactly 1/2 is in the disk.
4. Tape a paper band, or collar around the disk twice as high as the disk thickness.
5. Mix plaster of paris and fill the collar to the top.
6. When the plaster is set, flip the mold over and remove the putty disk.
7. Add some cooking spray oil or petroleum jelly to the plaster in the collar to prevent additional plaster adhering
8. Fill the other side with plaster of paris.
9. When the plaster is set, remove the paper band and scratch a match mark to aid alignment of the mold halves.
10. Separate the mold halves, remove the ball, scrape a sprue channel for the molten lead.
11. Bake the mold halves in the oven, really do this thoroughly, don't short cut this step
12. Get some thick gloves, hold the two halves of the mold aligned and tight together, pour in the melted lead.
13. If you were not diligent on step 11, the lead will shoot out of the mold with authority and velocity!
14. Carefully remove the hot bullet from the mold, be careful not to chip the mold inner edges.
Does this make sense?
P.S. Using this method a variety of lead or tin shapes can be molded, just don't expect a long life of the mold and don't drop it on the floor
Jim