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?

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[ivan salis]

it has the classic half round ball side with a flattened impact zone side ..looks like a "fired" 69 caliber (springfeild type caliber) round ball that impacted something hard when it was fired to me...

 

[Charlie P. (NY)]

I don't think it's a .69 as it expanded and flattened to not even that wide. I'd go with a flattened .45 or .50 caliber round ball. And that's still a guess.

If you can come up with the weight in grains that would help a lot.