I used to scrounge for old lead drain pipes to use for casting round balls for my muzzleloader.
They're pure, or virtually pure, lead and did very well.
I'm sure that old shower pans would also work very well.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.