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Old 6th November 2017, 02:35 PM   #7
Lead Moderator European Armoury
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Join Date: Dec 2004
Location: Portugal
Posts: 6,760

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 ? .
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