How to Measure Shotgun Bore Diameter and Barrel Thickness | MidwayUSA Gunsmithing

Published on July 23, 2015
Duration: 1:18

This guide details the essential steps for accurately measuring shotgun bore diameter and barrel wall thickness, crucial for gunsmithing and maintenance. Expert Larry Potterfield from MidwayUSA demonstrates the use of specialized tools like the Skeets digital bore gauge and the Newbolt & Thorp barrel thickness gauge, providing clear, actionable instructions for achieving precise measurements. Following these steps ensures critical dimensions are correctly assessed for any shotgun work.

Quick Summary

To measure shotgun bore diameter, use a Skeets digital precision bore gauge zeroed with a ring gauge, then add the gauge reading to the ring gauge diameter. For barrel wall thickness, employ a Newbolt & Thorp gauge with a dial indicator, measuring at specific points like 9 inches from the breech and at the muzzle.

Chapters

  1. 00:00Introduction to Shotgun Barrel Measurements
  2. 00:13How to Measure Bore Diameter
  3. 00:34How to Measure Barrel Wall Thickness
  4. 01:06Conclusion and Summary

Frequently Asked Questions

What tools are needed to measure shotgun bore diameter?

To measure shotgun bore diameter, you will need a Skeets digital precision bore gauge and a ring gauge for zeroing the tool. This combination allows for accurate readings of the internal diameter of the shotgun barrel.

How do you measure shotgun barrel wall thickness?

Measuring shotgun barrel wall thickness involves using a specialized gauge, such as the Newbolt & Thorp model. This gauge typically uses a dial indicator and a fixed barrel stop (e.g., 9 inches from the breech) to measure the metal thickness accurately.

What is the process for checking shotgun bore diameter?

The process involves zeroing a digital bore gauge with a ring gauge. Then, the bore gauge is inserted into the shotgun's bore to take a reading. This reading is then added to the known diameter of the ring gauge to determine the actual bore diameter.

Why are bore diameter and barrel thickness important for shotguns?

These dimensions are critical for shotgun performance, safety, and proper gunsmithing. Accurate measurements ensure correct choke installation, barrel integrity checks, and overall firearm functionality, preventing potential issues.

More Gunsmithing & DIY Videos You Might Like

More from MidwayUSA

View all →