Pure lead in Manitoba
I live in the south west. Many of the old buildings in the villages have pure lead on the roof where the vent pipe for the plumbing stack is.
Watch the wheel weights. The older ones were about 91% lead and a high percentage of antimony used to harden them. You have to add tin to them. Tin is available in bar solder. Sometimes you can pick up 50-50 or 60-40 bar solder at country auctions. It was used to seal sewer pipes in older times.
One caution is not to use new wheel weights. They will really screw up your mixture, and if you do use them, you have to REALLY CLEAN YOUR MELTING POT.
NEVER, NEVER, use plates from batteries. They have pockets of acid in them, and may explode when melted due to heating the moisture. Acid in your eyes will spoil your whole day,,,,,or life. You should always wear safety glasses anyway. Cheap insurance.
Buy a copy of Lymans Cast Bullet Handbook. It gives the composition of several more commonly obtained lead based metals.
.