I melted a pot of wheel weights last night and I didn't have my thermometer handy (it's been a while since I melted anything). So I was watching the melt like a hawk and just took out anything that didn't melt right away. What surprised me is that the stick-ons that I was "sure" were lead (softest of all of them - but not the foam ones) did not seem to melt at all.
I've been doing some reading and it seems that the higher-content lead weights have fewer alloys and melt at a higher temperature. If that's true, I guess I should grab them back out of the scrap pile?