Father of a friend died recently. She requested an urn for her key chain so she could put some of his ashes in. Since he was an avid hunter I used a 7.62x39 AR15 shell to make one. It is a steel shell which I spun on the lathe to sand it fine and then nickel plated it. I turned and polished a brass bullet and made a 1/4" threaded plug for the end. Added a small slip ring and done it is. The steel shell plated as easily as the brass shells did.