The pure lead is valuable. I get free lead roofing pipe jackets from a buddy. The pure lead is handy for shotgun slugs and muzzle loader bullets when tin is added (20-1 lead to tin). I also use it to stretch out my harder wheel weight lead when I am casting bullets for low velocity applications like .44-40, .44 special, .38 Special and .45 ACP. I have sold off excesses of pure lead on evilbay to finance more wheel weights.
Tin is the most overlooked casting metal (in my opinion). Wheel weights have almost no tin. While they cast a reasonably hard bullet, the introduction of 2-4% tin greatly enhances the bullet. They come out sharper, cleaner, brighter and a little harder than just with wheel weights.
Tin is easily added with 50/50 bar solder. I get mine through Rotometals.