Hi therick,
The Shell is a Leopard Tank case with a 105mm Howitzer projectile in it, because I couldn't find a Leopard Projectile and yes it is empty, the case beside it is a 5 inch Navy shell, I used to have a substantial collection of this stuff but sold it off, at our local gun show, ( it went like hot cakes). I had to sell it locally as Australia Post gets very upset if you try to mail that sort of stuff.
I have noticed on the forum that there are not many USA silver dollars recovered with the detectors, is this because they are so big that people didn't drop them, I purchased one recently for my coin collection, an 1880 Morgan very impressive coin it would be great to be able to dig them, all we have here in old coins is half Penny, Penny ( copper), threepence, sixpence, shilling, and florin (Silver), our new coins start at five cents and finish at $2, they discarded the one and two cent coins, All our coins are now made from a mix of copper, Aluminium, and nickel, however the $2 coins are about the size of a dime but thicker and hide nicely in the grass, they also add up quickly when you start to pick up a few.