.303 Marked Gauge Tool... identity?

[Son]

Dear brains trust... these pics of a tool clearly marked .303 Case have turned up on another board... Can anyone tell me what it is for so I can end the agony we are going through there.... The was another post from the OP to show a case does not go over the long rod.,.. unsure if it was a new case or a fired case, waiting for an answer to that.... here are the pics... thanks in advance, gents

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Update to add... this description just got posted there...." it's a gauging tool in the manufacturing process cases before they are drawn out and tapered"

The case in the pic below is a fired, unsized case, so max size... The explanation makes sense... measure the web- periodic testing during a batch lot for setting tooling?

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