I have never worked with casting lead round balls and am thinking about trying to make my own instead of purchasing them. Wondering about what devices to buy as well as finding reliable sources for soft lead. Any thoughts or suggestions? Thanks for your help.
Round ball casting is the perfect place to start as it is the easiest projectile to make. I'd recommend a Lee melting pot without the bottom pour feature ,a good RCBS or Lyman ladle, a good lead thermometer and Lee round ball aluminum molds.
You can get some nice lead from dental offices that the x-ray film comes in or at least used to. It makes very good round ball castings. Roof vent lead is also pretty good alloy as it is pretty pure lead.
I like to get the lead to about 750 degrees F. and the mold needs to be about the same temp for a good fill out. I let the mold set on the rim of the melting pot to warm up with the alloy. I like to see just a bit of frost on the casting which hurts nothing and insures a full diameter fill out. If you see wrinkles then either the melt or the mold is not hot enough. If you see excessive frosting then the mold is to hot.
The molds when new need to be stripped with acetone and then smoked with a candle or match. They do not need to be black with soot. A very thin film of smoke is all that is needed to make the balls drop out of the mold easily.
Never strike the mold blocs with your wood or rawhide mallet to remove a ball . Strike the mold handles at the rivet that hold them together.
After you get the molds and have stripped them with acetone get a carpenters pencil and coat the top of the closed mold, the underside of the sprue plate and the sprue hole funnel. This will keep lead from sticking on these surfaces.
Another thing that should be done on any mold is to remove the sprue plate and stone the underside flat and smooth removing any burrs from the sprue plate hole. Do this before coating with the carpenters pencil.
Sprue plate tension is important as if to loose the ball will have a ragged sprue and if to tight the steel plate will gall the mold top. This is especially important with aluminum blocks which all Lee molds are.
Keep any lube out of the mold as you will have to strip it and re-smoke to get good castings again.