A chamber casting is the result of using a material with a low melting point to make a cast mold of a gun’s chamber.

Casting is the best way to determine the exact internal chamber dimensions of a chamber.

Classic American Gunsmith only uses Brownells Cerrosafe Chamber Casting Alloy ⇒ to cast chambers.

aka:

• bore casting

Footnotes / Sources:

“Glossary ⇒.” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.