I'd like to know what the trick is to have the scrap yard take my spent brass. Every place I call around here in the STL metro area tells me they do not take spent brass from ammo.
The scrap yard has to assume responsibility for any live ammunition that may be mixed in with the empty cases, when they send it off to a foundry.
To avoid that liability, some places just don't take it at all.
(Even though most places, at least in my area, crush and/or shred it before shipment.)