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

Published on August 12, 2011
Duration: 1:30

This video demonstrates how to perform a chamber cast on a firearm, specifically a Remington Rolling Block rifle, to accurately identify its chambering. It highlights the importance of this technique for older firearms where original specifications may be unknown. The process involves cleaning the bore, plugging it, melting Cerrosafe alloy, pouring it into the chamber, and then measuring the hardened cast to determine dimensions and caliber.

Quick Summary

The safest method to identify an old firearm's chambering is by pouring a chamber cast using Cerrosafe alloy. Prepare by cleaning the bore and plugging it ahead of the chamber. Melt the Cerrosafe in a ladle, pour it into the chamber, let it harden, then measure the cast with calipers and compare to reference books.

Chapters

  1. 00:00Introduction: Identifying Firearm Chambering
  2. 00:15The Challenge & Solution: Pouring a Chamber Cast
  3. 00:28Preparation Steps for Chamber Casting
  4. 00:41Melting and Pouring Cerrosafe Alloy
  5. 01:00Measuring and Identifying the Caliber from the Cast

Frequently Asked Questions

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

The safest and most accurate method to identify the chambering of an old rifle is by pouring a chamber cast. This involves using a low-melting-point alloy like Cerrosafe, which is poured into the chamber to create a precise mold of its dimensions.

What materials are needed for pouring a chamber cast?

You will need Cerrosafe alloy, a lead ladle, a propane torch for melting the alloy, cotton patches for plugging the bore, a bit of oil, digital calipers for measurement, and reference materials like 'Cartridges of the World'.

How do you prepare the firearm for a chamber cast?

First, thoroughly clean the firearm's bore. Then, plug the bore with cotton patches placed just ahead of the chamber. Applying a small amount of oil can help the cast release more easily after it solidifies.

What is Cerrosafe alloy and why is it used for chamber casting?

Cerrosafe is a low-melting-point bismuth alloy (158-190°F) specifically designed for making chamber casts. Its low melting point makes it safe to handle and pour without damaging the firearm, and it expands slightly upon cooling, ensuring a detailed impression.

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