Civil War Case Shot???

[mpach033]

I recently found this conglomerate while metal detecting a beach in south Florida known for various wrecks including one from the Civil War. I went metal detecting on this beach after Hurricane Nicole passed through. After dissolving this conglomerate for a couple of hours in a salt and vinegar bath and cleaning it with a brush it's starting to look a lot like iron canister shot. It looks like it's still attached to the the metal rear plate as well. The ball is about 1 inch in diameter. Do you guys think this could actually be canister shot? The first picture is when I found it. The second picture is after I cleaned it a bit.

 

[Tom Hughes]

Any other civil war relics found in the vicinity?

 

[mpach033]

Found an iron buckle and piece of wood with a nail or rivet that could be from an old wreck.