30 Years trying to IDENTIFY This BULLET! Any Ideas?

[awksr]

I received this bullet in a civil war artifacts lot I acquired 30 years ago. Ive been researching it a lot more recently-and I can't find it anywhere. books, online, etc. Therefore-I am finally reaching out for some help. Somebody has seen this somewhere. I was led to believe it was found in Virginia battlefield or campsite, but i am not certain that is concrete. it is definitely dug from the ground, and has a nice patina.
Its looks just larger than a 58 cal mini-but most noticably, it has the neatest reading in the grooves like the edge of a silver dollar.
i have a photo next to mini for proportion. heres the measurements: bullet measures 567 in diameter X 1.066 in length and weighs 463 grains. The cavity is .535 inch deep.

 

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[smokeythecat]

Due to the "riffles", it is a post 1870 round made to fit the .58 muskets that came home from the Civil War. The riffles peg it as post Civil War, but people still make rounds and shoot them, and reproduction rifles today. So that round would have been used for deer hunting.

 

[awksr]

Due to the "riffles", it is a post 1870 round made to fit the .58 muskets that came home from the Civil War. The riffles peg it as post Civil War, but people still make rounds and shoot them, and reproduction rifles today. So that round would have been used for deer hunting.

Thank you for the help!
I thought is was possibly post civil war
Any idea who made it?
I never seen one pre/post civil war.
If i am putting it in my bullet display, so far i have "post civil war 1870+ .58 cal 3-ring w/riffles".

 

[Charlie P. (NY)]

It's an odd one. The shape - with the widest part at the rear - would indicate a breechloading rifle. Like a Starr Carbine.

But the reeding is odd for sure. Kind of indicating out was swaged rather than cast. A more modern process.