Wheel weights have no magical properties. They are a lead based alloy.
With pure lead, some Linotype, and a bit of magnum shot for As we can get as close as we need. Heck, we can make alloys that are even better for some situations.
I don't use any wheel weights right now. I mix and match what I have. My most commonly used base is range scrap. The range I shoot at has numerous pistol pits so it is easy to get a couple hundred pounds per year. This is by just spending a few minutes every time I go out. Nothing quite like coming home with more lead than I left with.