7.62 Russian case Gage Help

[flintlock62]

I have what I assume is a case gauge. It's marked 7.62 Russian, and is 28.8 mm long. Any help here would be appreciated.

 

[Cosmoline]

If it's a headspace gauge it's likely 7.62x39, but without any markings it's hard to say if you have a go or no go or field. The 54R is just a little rim.

But maybe it's some other kind of gauge like case internal length? Photo would help.

 

[flintlock62]

Sorry it's not in focus. It has 7.62 Russian printed inside the band. I measured it to be 28.8 mm long. The inside measurement is tapered from 12.3 mm to 11.7 mm on the small end.

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[Cosmoline]

Is it hollow? It almost looks like part of an old Lee Loader.

 

[flintlock62]

The inside measurements are 12.3 mm on one end, and 11.7 mm on the oterh.

 

[Cosmoline]

Those sound more like a 54R. Can you stick a 54R in there? It must be part of some resizing die.