In the Shop with Roy: Lathe Project

Published on December 24, 2025
Duration: 2:50

This video demonstrates a practical gunsmithing technique for modifying an RCBS powder measure bushing using a mini-lathe. Expert Roy Huntington shows how to precisely measure and machine an aluminum bushing to achieve a perfect fit for specific cartridge cases, ensuring spill-free powder charging during reloading. The process highlights the importance of accurate measurements and careful lathe operation for custom gunsmithing tasks.

Quick Summary

Expert gunsmith Roy Huntington demonstrates modifying an RCBS powder measure bushing using a mini-lathe. The process involves precise measurements of cartridge cases and bushings, followed by careful lathe machining to achieve a perfect fit, ensuring spill-free powder charging for reloading.

Chapters

  1. 00:00Project Introduction: Lathe for Gunsmithing
  2. 01:01Measurement & Calculation for Bushing Mod
  3. 02:02Lathe Machining & Final Fit Test

Frequently Asked Questions

How can I modify a powder measure bushing for a specific cartridge case?

You can modify a powder measure bushing by using a lathe. First, measure the cartridge case's outer diameter and the bushing's inner diameter. Calculate the material to remove (half the difference between the case OD and bushing ID). Then, use a lathe with a boring tool to carefully remove the calculated amount of material, ensuring a precise fit.

What tools are needed to machine a powder measure bushing?

Essential tools for machining a powder measure bushing include a lathe (a mini-lathe is shown), precision dial calipers for accurate measurements, and a suitable boring tool for the lathe. A digital readout (DRO) on the lathe is also beneficial for precise depth control during the machining process.

Why is precise fit important for a powder measure bushing?

A precise fit between the cartridge case and the powder measure bushing is crucial for accurate and consistent powder charging. A snug fit prevents powder spillage during the charging process, ensuring that each charge is consistent, which directly impacts the safety and accuracy of reloaded ammunition.

What measurements are critical when modifying a powder measure bushing?

The critical measurements are the external diameter of the cartridge case you intend to use and the internal diameter of the powder measure bushing. You need to calculate the precise amount of material to remove from the bushing's inner diameter to achieve a perfect, yet not overly tight, fit for the case.

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