Relieving Chamber Cones?

[OH Osthaus]

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,

[Theodore LeDurt]

The term used in Diggory Hadoke's book. "Vintage Guns For The Modern Shot", uses the term "relieve chamber cones", unless this is the English term for forcing cones, I was talking about chambers, not forcing cones.