Chambers are measured from the breech surface of the barrels forward to the point where the taper of the forcing cone begins. If it measures 2.5” then you have 2 1/2” chambers.
On chambers with the tapered forcing cone, paper shells that open 1/8” longer than the chamber length were intended to be used. The extra 1/8” of shell length that opened into the cone was to provide a superior gas seal.
It is not advisable to lengthen the chambers on these old doubles. Not only do you destroy the value of the gun, unless wall thickness is very carefully measured, lenthhening chambers can compromise the integrity/safety of the barrels
.
__________________
"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.
|