Cerrosafe alloy was originally made for casting toy soldiers. One of its most popular uses today is casting to check firearms chamber dimensions. The alloy shrinks a small amount during the first few minutes after casting, which aids in removal from the chamber. After 30 minutes the metal will be dimensionally identical to your chamber.
Casting a chamber allows you to check the dimensions not only of case body but the neck, and throat as well. It is reusable and easy to use. Tool makers know what to expect from Cerrosafe so you can send castings to tool makers or reloading die makers.
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