I tumbled the shot with water and a handful of sheet metal screws. it worked ok, it just trashed the Chinese rock tumbler. I'm going to try the lime away idea. I'm not going to give up, shot is expensive and we shoot a lot of shells in my sons vepr 12. that gun is crazy fun.
separating sand from the shot is a pain, I already did that once after I dug it from a turkey shoot and an old skeet range.