Day 3

Published on December 20, 2022
Duration: 9:09

This video details the process of casting a firearm's chamber and forcing cone using Cerosafe, a low-melting-point alloy. The instructor demonstrates how to create a mold of these critical areas to assess their dimensions, particularly for understanding how they will interact with modern ammunition like tungsten shot. The process involves melting Cerosafe, pouring it into the chamber, allowing it to solidify, and then removing the cast for analysis. This technique is crucial for gunsmiths and reloaders preparing firearms for specialized ammunition or modifications.

Quick Summary

The forcing cone in a shotgun is the tapered area between the chamber and the bore, critical for shot pellet transition. Older shotguns often have short forcing cones (around 0.5 inches), while modern ones feature longer ones (1.5+ inches) to better handle plastic wads and harder shot like tungsten, reducing stress and improving patterns. You can cast your chamber with Cerosafe to measure its forcing cone length.

Chapters

  1. 00:00Introduction: Forcing Cones and Tungsten Shot
  2. 00:15Understanding Forcing Cones: Resources
  3. 00:46Casting Chambers with Cerosafe
  4. 01:0212 Gauge Cerosafe Cast Analysis
  5. 01:11Evolution of Forcing Cone Lengths
  6. 01:29410 Bore Cerosafe Cast Attempt
  7. 01:57Historical Context: Paper Shells vs. Plastic Wads
  8. 02:37Modern Shotguns and Forcing Cones
  9. 02:53Tungsten Shot and Forcing Cone Interaction
  10. 03:10410 Bore (H&R Topper) Analysis
  11. 03:39The Need for Forcing Cone Lengthening
  12. 03:52Gunsmithing Option: Lengthening Forcing Cones
  13. 04:19Benefits of Modernizing Firearms
  14. 04:45Personal Connection and Gunsmithing Decision
  15. 05:04Conclusion: Next Steps and DIY vs. Pro

Frequently Asked Questions

What is a forcing cone in a shotgun and why is it important?

A forcing cone is the tapered section between a shotgun's chamber and bore. Its length and angle are crucial for smoothly transitioning shot pellets into the barrel, impacting pattern performance and recoil. Modern shotguns typically have longer forcing cones than older models.

How can I determine the forcing cone length of my shotgun?

You can determine your shotgun's forcing cone length by creating a cast of the chamber and bore using Cerosafe, a low-melting-point alloy. This cast allows for precise measurement of the tapered section between the chamber and the barrel.

Why is forcing cone length important for tungsten shot?

Tungsten shot is harder and denser than lead. Forcing it through a short, abrupt forcing cone in older shotguns can lead to increased pressure and potential barrel damage. Longer forcing cones provide a smoother transition, reducing stress on the shot and barrel.

Is it possible to lengthen a shotgun's forcing cone?

Yes, it is possible to lengthen a shotgun's forcing cone through gunsmithing. This is a common modification for older firearms to improve their compatibility with modern ammunition, especially harder shot materials like tungsten, and can also reduce felt recoil.

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