3 :shrug: Ringer??

[doublet2a]

I live in California, Don't find many of these here
So can anyone tell me??
It looks to be about 51 mm/ or slightly less than 1/2 in.
In diameter
Henry shells are about the oldest we find here
And some solid brass shot gun shells
Thanks for any help in advance

HH TIM

 

[adam in cal]

n/t

 

[ivansalis]

blackpowder pre cartrage era---.50 cal 3 ring (THE rings acted as gas seals) bullet.

 

[Ron Lord]

I looked in all Civil War books and can't find this Bullet. It may be a modern Bullet.

 

[doublet2a]

Thanks for the info junklord & ivansalis
I think it may be a modern one also
And adam...........