What caliber is this bad boy?

[Copet]

This bad boy is a big caliber. What caliber is this?

 

[stetam]

I don’t think that’s a firearms cartridge and what’s the barber next to it a dime a quarter a half?

After looking at it twice, I’m sure that’s not a firearms cartridge

 

[Rattlehead]

Lipstick tube maybe?

 

[Iggyks]

This looks vaguely similar, it's of a Spencer 56-50 blank. A measurement of the casing in the middle between the rim and the rounded end would help. It looks huge.

 

[sube]

Brass shotgun shell ? sube

 

[Carl-NC]

Looks like a rimfire blank, you'll have to measure it to determine caliber.