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TFB Armorer’s Bench: An Education on Chamber Casting

Talyn

Talyn

SAINT
Founding Member

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

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It would be interesting to see what like cartridges in different guns would compare. On some custom barrel sites I'll see where you can get a casting from them if your finished product. I might do that next time?
 
I do know this practice is very helpful if you cast your own rifle bullets, that way you can size them to your own "Chamber Throat"
 
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