Why and What is Chamber Casting?
Chamber casting is the act of pouring a soft and low melting point liquid metal into the chamber of a firearm and allowing it time to turn to solid. Once solid, the metal can be punched out of the bore and you ideally will have a cast of a cartridge, albeit not perfect in some ways. This will allow you to measure certain spots on the casting and compare them with documented dimensions of a cartridge to decide what it is chambered for.Education on Chamber Casting