The live rounds in the woods may not even be ejected shells. Some of the hunting vests and or belts have loops to hold shotgun rounds. When they have been around for a few seasons the loops can get a little loose so maybe someone is just loosing ammo as they walk. (Have actually had this happen...which really pisses you off when you are pheasant hunting and are 2 miles from your truck) Or maybe they just have a hole in their pocket. As far as the range goes...I have dropped live rounds before without knowing it (roll of the bench or whatever) but that is why I police the area when I am done. Try to leave it cleaner than when I arrived and not leave stuff behind.