How to Backbore the Barrels on a Parker Brothers Shotgun | MidwayUSA Gunsmithing

Published on July 23, 2015
Duration: 1:18

This guide details the process of backboring shotgun barrels, a gunsmithing technique essential for repairing pitting that cannot be otherwise addressed. Expert instructor Larry Potterfield from MidwayUSA demonstrates how to select appropriate PTG reamers, apply cutting oil, and carefully ream the barrel to restore its integrity. The process is described as demanding but crucial for older firearms.

Quick Summary

Backboring is a gunsmithing process to repair shotgun barrel pitting by reaming out the interior, effectively increasing the bore diameter. It requires specific tools like PTG reamers, a T-handle, cutting oil, and a vise. The process involves careful clockwise reaming, frequent chip removal, and continuous cutting to the muzzle.

Chapters

  1. 00:00Introduction to Backboring
  2. 00:10Instructor and Tool Introduction
  3. 00:16Reamer Selection and Design
  4. 00:29Backboring Procedure Steps
  5. 00:44Extending the Cut
  6. 00:57Post-Reaming and Progression
  7. 01:04Conclusion: Demanding Process

Frequently Asked Questions

What is backboring and why is it done on shotgun barrels?

Backboring is a gunsmithing technique used to ream out the inside of a shotgun barrel, primarily to address pitting that cannot be filled by other means. This process effectively increases the bore diameter and restores the barrel's integrity.

What tools are needed for backboring shotgun barrels?

Essential tools include specific backboring reamers (like PTG reamers), a T-handle, a T-handle extension, cutting oil, a wire brush for cleaning, and a vise to secure the barrel. Eye protection is also mandatory.

How do you ensure consistent cutting when backboring a shotgun barrel?

To ensure consistent cutting, use a T-handle with an extension if needed and mark the handle against the barrel. This helps maintain a continuous cutting path from the breech to the muzzle, ensuring an even bore diameter.

What are the key steps in the backboring process?

The process involves selecting the correct reamer, applying cutting oil, turning the reamer clockwise while frequently clearing chips, and advancing the cut with extensions. Progressively larger reamers are used as needed.

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