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Old 6th November 2017, 02:55 PM   #8
Cerjak's Avatar
Join Date: Jan 2012
Location: FRANCE
Posts: 989

Originally Posted by fernando
Wow; i have never heard of that; on the contrary, to my understanding, the actual muzzle aperture marks the calibre (bore/gauge) and the bullet to fit there has a narrower diameter... assuming we are talking smooth non rifled barrels, obviously. Why would you have to add one centimeter to quote the gun's calibre ? .

When you using a" pied coulisse" ,for internal diameter you have to add 1 cm to the mesure shown to have the internal diameter.
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