The local range I go to bulldozed the berm this spring to a nice layer of clay. They recently opened it up for the year so there wasn't really much there but how would you go about recycling from a clay berm? I picked up about a dozen slugs from on top of the dirt but didn't really find much else. They have a steel pistol target that I cut the sod into squares underneath and then shook upside down over a bucket. Managed to get about 10 lbs in less than 10 minutes. The other range I frequent hasn't been dug in a very long time but I'm assuming it's clay too. Everything here is clay.