I have a 223 C.O.A.L. case that is a duplicate.
This is the Hornady modified case for the cartridge overall length gauge to determine bullet seating depth for a particular rifle.
If you have the tool and need the 223 it's yours.
I've been treated well on this board so this is a pay it forward.
First response with PM gets it. I have a week's worth of work left (it's Wednesday) so I won't get to mailing it until probably Saturday.