The local FBI and Sheriff's Dept. have a range in the hills behind where I went to college. I used to dig around in the sand and dirt piled behind the targets and find pounds of lead, mostly .38 wadcutters. The Sheriff's didn't mind - as long as I didn't make a mess. Then the FBI guys caught me one day. Hoo boy. It's probably all 9mm FMJ there now, anyway.
I reuse my plinking and target rounds when I can find them. Sounds piddly, but if you shoot in the same spot long enough it will add up. I have a buddy who's a recycling engineer (runs a junk yard) and he keeps me supplied. I found a bunch in a dumpster when a local high school threw out the plugs from the lab rooms that were used to allow a sink to fill with water (each was a long hollow tube with holes on one end and a taper to the opposite end to plug the sink drain). Must have got 25 at about two pounds each. Didn't want to think about what they might have been in contact with over the years, but they were pure lead. (I was in HS at the time - I don't recommend hanging around one now a days). Found a weight belt with three, ten-pound weights attached on the bottom of a lake. I'm sure there was a story behind that. A friend got a piece that took two people to lift into his trunk at a marina where they had shortened a lead keel (maybe 200 lbs) free just for asking. Lead is all over. No wonder society is acting so odd lately.
I have been told that 1,200 shots/yr. is the magic number. If you shoot less than that it's not worth the time and effort (& initial investment) to cast your own balls.