You might want to look at CBE-Cast Bullet Engineering for a bullet mould also. http://www.castbulletengineering.bigpondhosting.com/custom.htm They make a top quality mould at very reasonable prices.

Zinc wheel weights are ususlly maked ZN The will be hard and you shouldn't be able to scratch them with your finger nail. Also when you are smelting them they will float to the top of the molten lead. You want to keep your melting temeperature down so they don't melt into you lead and contaminate.

When you spot one set it aside and when you get 20 or 30 lbs worth of them put them in one the post office flat rate boxes and mail them to me and I'll make round ball for my mortars.