Need some id on a bullett please

[montanagold]

Hey all, I found this a year ago or so and it's been bugging me on what it came from. I put it next to a mini ball for size comparison it has a flat bottom and 6 flat sides. Any info would help. Thanks. Pics to follow

 

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[montanagold]

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[montanagold]

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[DigDug1]

I do not claim to be a civil war bullet expert but the bullet in question seems lik,e more of a modern muzzleloader slug. Do you have calipers to measure the bullet with?