Name the mystery cartridge


Seen Your Member
it measures .308 but it's shorter than the Winchester .308 rifle cartridge. Found it in a trade in truck at work. 9mm on the left just for scale.

I could/should get down on this. I have some interesting rounds/firearms... Well, at least a few before they all sank on that boat while fishing... Hahaha.
Is the one on the left a .257 Roberts?

Hmm. The case doesn't look right though, extractor lip not in the case, more outside of it...
Maybe .22 hornet.