ID Help on Civil War Period Item

[ldhrelics]

This item was carried back from the Civil War by a soldier and sat on a mantle for years. I don't have it in front of me, but it is somewhere between 3-1/2" and 4-1/2" in diameter and appears to be copper or brass. It's solid and heavy. I was thinking maybe part of an artillery shell, but I really have no idea. My hunting buddy now has it. It was carried back by his wife's grandfather who was somehow associated with Stonewall Jackson's command. He walked from Richmond to Southwest Virginia carrying it so it must have been important to him. As a side note, what appeared to be an identical item was seen in an episode of Bonanza sitting on Ben's desk according to my hunting buddy. Any information would be appreciated.

 

[timwied]

What's the bottom look like is it hollow? I looked up all of Ben Cartwright's desk images on Google and don't see anything like that, there is a what looks like a cookie jar though?