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No idea on caliber, I'd hate to git shot by it. Is that a spear point? Later Clyde
Your bullet is not an Enfield... according to the "Handbook Of Civil War Bullets & Cartridges" it is a .69-caliber yankee machine-pressed-&-turned minie (made in a bullet-press machine, not by casting). See bullet #188A in that book. The version you found, which in your photos appears to not have any body-grooves/rings, is extremely rare. That specific version is known to have been dug at Missouri civil war battlesites & yankee campsites.
I should mention, it was previously called a Prussian in the older civil war bullet books, but the Thomas Brothers' recent research in civil war US Ordnance Department bullet-production records has proved it is a yankee machine-made minie, not an import from Prussia.