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Old April 4, 2022, 08:18 AM   #6
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 17,709
108/40 is the gauge of the bore, an odd way of describing a rifle. I figure it is a quick check with a plug gauge. The measure is 8.87mm but I think it corresponds to a 9.3mm calibre. Maybe 9.3x72; a common drilling rifle barrel.
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