QUESTION ON PROOF STAMPING ON FRANCOTTE HAMMERGUN

[Bob Jurewicz]

Here is a picture of the barrel flats on a 1911 A Francote 12 GA Hammergun.
Anyone know the meaning of the D=65 divided by 20.6 m/m?
Bob Jurewicz

[David C Porter]

65mm= 2 1/2" or 2 9/16" chamber lenght.
20.6MM= Chamber ID, .811"

Chamber dimensions in millimeters shotguns undergoing smokeless proof. Length of chamber over diameter of chamber

[Bob Jurewicz]

Thank you David!
Bob Jurewicz

[Bill Jolliff]

Hi Bob - I sent you a PM.

Bill