I've seen a couple of shot harvesters. The ones I've seen simply let the shot(and dirt) fall off the end of a conveyor belt. As it fell, a powerful fan blew through the mix and blew away the non lead junk. There was no melting or re-shaping done with these machines. They were sort of Rube Goldberg contraptions, as I recall. I used a bit of it in my early days of reloading but lost interest a long time ago. IME, it has always followed the price of new shot too closely to be considered a bargain. JMO, of course
