I direct this question towards, Smith Crazy, Paul, Skip Or anyone else that wants to answer.
I have been casting bullets from wheel weights for over 40 years and I was asked a question today that I just got a dumb look on my face and answered "I don't really know".
I just never bother to find out as it wasn't that important to me.
The question I was asked was.
"Out of 100 lbs of wheel weights how much useable/castable lead do you get?"
I told the person I never took time to work it out but my best guess was about 70# buy the time you took the tire stems, lug nuts, paper and the metal clips out it was close to 30% loss.
I have already casted all of my wheel weights into ingots, none left at the moment
Inquiring mind NOW want to know. :-)