How to Pour a Chamber Cast Presented by Larry Potterfield | MidwayUSA Gunsmithing

Published on August 12, 2011
Duration: 1:30

This guide details how to perform a chamber cast using Cerrosafe alloy, a technique demonstrated by Larry Potterfield of MidwayUSA. This method is crucial for accurately identifying the chambering of older firearms, like the Remington Rolling Block rifle discussed, when original markings are unclear or absent. The process involves cleaning the bore, plugging it, melting and pouring Cerrosafe, and then measuring the resulting cast to determine the exact cartridge dimensions.

Quick Summary

Pouring a chamber cast using Cerrosafe alloy is the safest method for identifying the chambering of older firearms. This technique, demonstrated by Larry Potterfield, involves cleaning the bore, plugging it, melting and pouring Cerrosafe, and then measuring the hardened cast with calipers for accurate identification.

Chapters

  1. 00:00Introduction to Remington Rolling Block Rifle
  2. 00:15The Challenge and Solution: Chamber Casting
  3. 00:28Preparation for Casting
  4. 00:41Casting Process with Cerrosafe
  5. 01:00Measurement and Identification

Frequently Asked Questions

What is the safest method to identify the chambering of an old rifle?

The safest method to identify the chambering of an old rifle is by pouring a chamber cast using Cerrosafe alloy. This technique provides precise measurements of the chamber, allowing for accurate cartridge identification, especially when original markings are unclear.

What materials are needed to pour a chamber cast?

To pour a chamber cast, you will need Cerrosafe alloy, a lead ladle, a propane torch for melting the alloy, cotton patches and oil for preparing the bore, and digital calipers for measuring the final cast.

How does Cerrosafe alloy work for chamber casting?

Cerrosafe is a low-melting-point alloy that melts between 158-190°F. It is poured into the firearm's chamber and expands slightly upon cooling, creating a precise impression of the chamber's dimensions, which can then be measured.

What is the purpose of plugging the bore before casting?

Plugging the bore with oil-soaked cotton patches just ahead of the chamber prevents the molten Cerrosafe alloy from flowing too far down the barrel. It also helps ensure the cast is easily removed after it hardens.

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