Generally, an original chamber will have been cut at a very modest taper over it's entire length, rim recess to the beginning of the forcing cone, by as much as .003"
If a chamber was lengthened it is very unlikely that this profile will have been continued through the additional cut length of as much as 1/2"...... but it would be extremely difficult to detect a taper in just a half inch, even if it had a taper.
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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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Hybrid Mode