breech question

[Larry Akers]

I have a Traditions Pennsylvania flintlock rifle on which I have to make a repair for a fellow clubmember. The rifle has a chambered breechplug which I do not need to remove and don't want to. I have not been successful with internet searches hence my question. Does anyone know the diameter of the chamber boring?

 

[Grimord]

Not sure about the diameter, but a .357 bronze brush seems to fit the chambered area just fine for cleaning.