I found this cartridge in a bucket of ammo. It looks like just a solid piece of brass where the primer should be. My picture didn't come out the clearest but I hope it shows what I mean. It doesn't look like the groove around the primer was machined out, but it does look fairly old to me. The bullet is a roundnosed lead with a bit of white oxidation. Is this some sort of weird priming, or just a cartridge that has been fooled with?
The groove around the primer is deeper than it appears in the picture, I am guessing about the thickness of the rim. I couldn't get anything into the groove that would reach the bottom
Measurements are as follows
OAL 1.455 "
case length .910
rim dia .495
case dia .440
bullet dia .437 (at the widest point outside the case)
"Primer" dia .215