How to Crown the Barrel of a Rolling Block Rifle | MidwayUSA Gunsmithing

Published on April 30, 2009
Duration: 1:31

Larry Potterfield, an expert gunsmith from MidwayUSA, provides a detailed guide on how to properly crown a rifle barrel. This process involves precisely cutting the barrel to its final length using a bandsaw and lathe, then carefully creating a radius crown with a custom-ground tool bit. The final steps include polishing the crown with progressively finer grits of emery cloth and cleaning the bore. This technique is crucial for improving rifle accuracy and performance.

Quick Summary

Learn to crown a rifle barrel with expert guidance from Larry Potterfield at MidwayUSA. This detailed process involves precise cutting, facing, and radius grinding on a lathe, followed by polishing with emery cloth, all crucial steps for enhancing rifle accuracy and ensuring a clean bullet exit.

Chapters

  1. 00:02Barrel Preparation
  2. 00:11Introduction & Tool Setup
  3. 00:16Measuring and Marking
  4. 00:34Cutting Barrel to Length
  5. 00:46Chamfering and Crowning
  6. 01:03Polishing the Crown
  7. 01:08Final Cleaning

Frequently Asked Questions

What are the essential steps for crowning a rifle barrel?

The process involves preparing the barrel, cutting it to final length with a bandsaw, precisely facing the muzzle on a lathe, creating a radius crown with a custom tool bit, and finally polishing the crown with progressively finer emery cloth for a smooth finish.

What tools are needed to crown a rifle barrel?

Key tools include a metal-cutting bandsaw for initial cuts, a lathe with a four-jaw chuck for precise machining, a scribe for marking, layout fluid, a custom-ground tool bit for the crown radius, and various grits of emery cloth for polishing.

Why is barrel crowning important for rifle accuracy?

Crowning ensures a clean and uniform bullet exit from the muzzle. A well-crowned barrel helps maintain consistent gas release and bullet trajectory, which are critical factors in achieving optimal rifle accuracy and performance.

What grit emery cloth should be used for polishing a barrel crown?

For polishing the barrel crown, start with a coarser grit like 120-grit emery cloth, then move to 180-grit, and finish with a finer 220-grit emery cloth to achieve a smooth, precise surface.

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