I say ...you'll just have to deal with it,bore was around alot longer than gauge .
Then again I'm from Newfoundland I've never said ass in my life ,it's always been arse...,we use me instead of my in reference to a belonging (as in kiss me arse )...come to think of it we all sound funny up here anyways ,or so I've been told by the rest of the Country
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Come to think of it , we call a break open gun a "breech loader" (we say britch loaden gun ).
Bore ain't that bad,but then again it sounds right to me because I come from the last British colony in the new world
But this could just be me shagging around ...as Newfies are apt to do