I have permission to hunt an old army site that was closed by BRAC some years ago. The site has been in use for various things since the early 1800's. The centerpiece is a very large parade ground-gotta be lots of good stuff there! Biggest problem is old brass rifle shells! Zillions of them everywhere and they ring from upper 70's into the mid 80's. Any good ideas for setting to help sort through the brass and get to the good stuff?