Any dent that can be seen inside the bore is an obstruction to some degree. The smallest of them won’t affect the pattern while the larger ones can actually act as an obstruction that causes a bulge.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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