Another thing to consider with bullet casting today, is the fact it has become far more difficult to obtain lead in volume cheap enough to make it worthwhile. You can buy commercially produced bullet casting alloy from places like Midway, and a few other shooting supply outlets. However the stuff is crazy expensive. And the shipping cost will kill you.
The other more important factor today, is the fact lead is treated as a dangerous carcinogen in todays modern world. Years back no one really cared about it. I used to go to various scrap yards and buy large amounts of it for literally pennies a pound. Bring it home and smelt it into one pound ingots. Now they won't even sell it to you. Most of these scrap yards are licensed to buy from the public, but not to sell. It's gotten to the point of ridiculousness. Many states like California treat the stuff like it's nuclear waste. Even plumbing solder cannot be used to code in most places unless it's 90/10 Tin based. 50/50 used to be the norm, and it was much easier to get a good leak free joint.
Back when I started casting, Linotype machines were becoming obsolete. If you contacted the more established printing companies, many of them would let you have old Linotype they had lying around for FREE. They just wanted rid of it. It was heavy, and difficult to dispose of. Now the stuff is treated like gold by bullet casters. Because it has become so expensive and difficult to obtain. Linotype alloy was almost the perfect bullet casting alloy. It contained 84% lead, 12% antimony and 4% tin. Cut it with a little pure lead, and you had beautiful, hard bullets that filled the mold perfectly, and never leaded the barrel, except at extreme velocities. With a gas check underneath, they were almost like jacketed bullets.
Back then most any chain tire store like Goodyear and Firestone would be happy for you to take old wheel weights off their hands. The only competition bullet casters had back then were fishermen who cast their own sinkers. And they were few and far between. But today these casting alloys are very difficult to obtain. Let alone obtain at a price that makes the whole casting venture worth it. So if you still decide to go through with it, check around before you sink any serious money into cast bullet reloading. Because as they say, times change, and they rarely change for the better. This is very true in regards to bullet casting.