Originally Posted by Imperdix
How would anyone know that a chamber had been altered from 65 to 67mm ? Surely the test is by plug guages on a go/no go basis and if 70mm doesn`t go.......

Plug gauges wouldn’t work on older guns. Prior to establishing SAMMI standards there was no standard size for chambers. Guns I have from 1870 and later have chamber dimensions all over the board.


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