Found this bullet at a spot where I found several .58 cal Washington Arsenal bullets . I have no idea on this one. Hopefully one of you guys can ID it.
0.364"? There was a Missouri .36 caliber Minie used in the CW (Missouri State Guard) but I have no idea what they looked like. I don't know much detail about CW projectiles. Never run across them up here.
Could also be more modern. 0.366"/9.3mm is a popular large-game bore size in Europe and there may be blackpowder cartridges that used that bullet.