I know about the materials which can be used for casting a chamber but unfortunately all are difficult to locate in this area.
I have a barrel which I received as part of the estate of a former Bush gunsmith.
The barrel was originally for a No.1 Mk III* .303"; the original chamber has been cut off; the outside of the stub turned down and then soldered into the bored out knox form of a .310" Cadet Rifle. The barrel was then rechambered for a rimmed case somewhere between the .357/.38 rim diam. and the .44 M/Spl rim diam.
There are no other markings to indicate the cartridge and the Chamber reamer was not amongst the rest of his equipment which I received.
So, what can I use to cast the chamber considering the care I may need to take as the barrel is soldered into the Knox form?
Any help would be appreciated.
John