Yep, all three are recycling saleworthy, but not when mixed up togetherSkiprr wrote: Like you, my 'spicion is that it's mostly (if not all) about selling the reloadable cases. Some smaller ranges may actually sort the leave-behind cases, but my bet is that it isn't efficient for larger ones to do that, and that they contract with recyclers to take the spent cases in bulk. Consistently having a bunch of steel and aluminum in there would probably greatly diminish the monetary return the range gets, or even jeopardize the recycling contract.
getting rid of the steel case stuff is relatively quick and easy. Can you say "BIG magnet"? Separating aluminum from brass is a different story.....there's probably some rube goldberg device out there that can do it based on differing densities (sorta like panning for gold in dirt, except you're panning for brass in aluminum) but not quick/cheap.....