I don't know about anyone else, but copper and lead both might become a precious illegal metal if the EPA continues down its path of BS. Copper is being stolen even now, from abandoned, unoccupied buildings and homes in foreclosure and even my church recently had all the HVAC copper stripped out. Lead is very close to being labeled as dangerous as asbestos. If I had the skills, I would make my backstop where I could recover as much as possible.
The way mine is set up, it will capture almost all bullets. But recovery would only take place during a rehab. And I hope that's several years down the road. I have so far, recovered about 50 pounds of lead through various sources. Most of it is very clean, pure lead. The boys, AKA The Brass Monkeys, also love picking and scavenging around the backstop for "souvenirs". They bring me quite a bit of copper lead and brass. Yes, they wash their hands and they know to be careful.... For those of you in worry-wart land.