Wheel weights? Haven't used them in a long time for a couple of reasons. First, the alloy is not consistent, they use whatever is available to make the weight. I like to be able to repeat the recipe each time I cast. Second, even when I first got into casting, back in the last century, wheel weights were not common enough to count on a supply. AS cheap as I am, I buy lead and tin from a smelter. This, for me, is the better way to ensure I can pour a 20/1 alloy or a 16/1 alloy or whatever I want to pour for that bullet.
Other folks have different ideas and that is a good thing.
Kevin