What is it?

Received the below photos from a friend of mine. He asked me what it was and I told him I would ask the experts. The case is an all brass Winchester No 16. In my opinion the primer pocket has been drilled out and filled with some type of plug. Looks like some type of pistol or rifle case sticking out of the top and it has all been filled with soldier or lead. Cant figure out what the circles are that can be seen around the small cartridge case. My guess it is some

ones idea of cartridge art. rich%20shotshell%203