In the Shop with Roy: Lathe Project

Published on December 24, 2025
Duration: 2:50

Roy Huntington, an expert gunsmith, demonstrates how to modify an RCBS powder measure bushing using a lathe for precise cartridge case fit. This guide details the measurement, calculation, and machining steps required to achieve a spill-free powder charging setup, highlighting the importance of precision in reloading.

Quick Summary

Expert gunsmith Roy Huntington demonstrates modifying an RCBS powder measure bushing using a lathe. This process involves precise measurements with dial calipers, calculating material removal (e.g., 0.003" per side), and using a lathe's boring tool to achieve a perfect, spill-free fit for specific cartridge cases, enhancing reloading accuracy.

Chapters

  1. 00:00Project Introduction & Bushing Need
  2. 01:01Measurement and Calculation for Modification
  3. 02:02Lathe Machining and Final Fit Demonstration

Frequently Asked Questions

How can I ensure a precise fit for my powder measure bushing?

Use dial calipers to measure the bushing's internal diameter and the cartridge case's external diameter. Calculate the difference and use a lathe with a boring tool to remove the necessary material, typically cutting 0.003 inches per side for clearance.

What tools are needed to modify a powder measure bushing?

Essential tools include a lathe (like a mini-lathe), dial calipers for precise measurement, and a boring tool for the lathe. A digital readout (DRO) on the lathe enhances accuracy.

Why is modifying a powder measure bushing important for reloading?

Modifying a bushing ensures a perfect fit for specific cartridge cases, preventing powder spillage during charging. This precision is vital for consistent powder charges and accurate ammunition.

What is the typical machining cut depth for modifying a powder measure bushing?

A common target cut depth is around 0.003 to 0.0035 inches per side. This allows for slight clearance, ensuring the case fits snugly without being too tight, facilitating spill-free powder charging.

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