no in simple terms
the chamber is the area for the shotshell - this decides the length of the shell for that gun.
the forcing cone is the transition area from the chamber to the barrel.
relieving forcing cones on their own is I believe generally done to reduce felt recoil and improve pattern
the forcing cones would be altered if the chamber is lengthened,
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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