I was gifted a wooden box with a bunch of loaded 9.3x72R cartridges recently. In this box was also the appliance shown below. It seems to be a cartridge gauge perhaps? It is solid brass with no visible markings. The cartridge rim rests below the flange about 0.015"-ish when inserted. The bullet will not enter the small end but I have not measured it. Any help with ID'ing is appreciated.

Thanks,
Hoot

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]