Boondocking, at dusk we heard full automatic weapon fire (one was an AK47 with its distinct sound.) The shooters were nearby, just the other side of a small stand of pines. The shooting continued for about half an hour.
The next morning we walked over to the spot, and found brass everywhere, shot up trash, broken glass, shredded cans, etc. Lots of beer cans. (oh boy! Automatic weapons and alcohol. Always a good combination.)
No cell phone coverage, so we drove a few miles to call the local sheriff. A deputy eventually came out, took photos, our statements, and collected some of the brass.
Never heard any results of the investigation. Probably wasn't one.