What kind of bullet is this

[zbrown210]

Found this at a civil war site and am wondering what kind of bullet it could be, smashed round ball, 20 slug, carved bullet?http://images.tapatalk-cdn.com/15/12/01/750d5c63bf3426166f3a5440d4d326ed.jpghttp://images.tapatalk-cdn.com/15/12/01/9a33769afb78f484f65bec4171b684dd.jpghttp://images.tapatalk-cdn.com/15/12/01/15d1e89c5086189ec07c5c59ef2b98a0.jpghttp://images.tapatalk-cdn.com/15/12/01/92fcb3b306cb78946abcbef69c6a6605.jpg

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[Full Metal Digger]

I'm no expert but it looks like a fired musket ball to me.