How to Convert a Rolling Block from 32 Rimfire to 32-20 WCF | MidwayUSA Gunsmithing

Published on December 23, 2013
Duration: 6:52

This guide details the advanced gunsmithing process for converting a Remington No. 1 Rolling Block rifle from obsolete .32 Rimfire to the more common .32-20 WCF centerfire cartridge. Expert gunsmith Larry Potterfield demonstrates the precise steps, including chamber reaming, breech block modification for centerfire ignition, and fabrication of a new firing pin. The process requires specialized tools and a high level of skill, suitable for experienced gunsmiths.

Quick Summary

Expert gunsmith Larry Potterfield demonstrates the conversion of a Remington No. 1 Rolling Block from .32 Rimfire to .32-20 WCF. This advanced process involves reaming the chamber, modifying the breech block to accept a centerfire firing pin, and fabricating a new firing pin, requiring specialized tools and precision.

Chapters

  1. 00:00Introduction and Rifle History
  2. 00:58Conversion Rationale
  3. 01:19Reaming the Chamber
  4. 02:32Breech Block Modification
  5. 04:18Drilling the Centerfire Channel
  6. 05:36Firing Pin Fabrication
  7. 06:33Reassembly and Test Fire

Frequently Asked Questions

What is involved in converting a .32 Rimfire Rolling Block to .32-20 WCF?

The conversion involves reaming the chamber to .32-20 WCF, plugging the original rimfire firing pin hole, drilling a new centerfire firing pin channel, and fabricating a new firing pin. Headspace must be precisely set during the process.

What tools are essential for converting a .32 Rimfire to .32-20 WCF?

Essential tools include a .32-20 chambering reamer, a lathe for firing pin fabrication, a milling machine for breech block work, taps for threading, and various precision measuring instruments like a straight edge.

Why convert an old rifle from rimfire to centerfire?

Converting from an obsolete rimfire to a more common centerfire cartridge like .32-20 WCF allows the firearm to be safely and reliably used with readily available ammunition, preserving its functionality for shooting purposes.

How is headspace set during a Rolling Block conversion?

Headspace is set by using an empty .32-20 WCF case in the reamed chamber and a straight edge across the breech face. The goal is to have the case head approximately 0.002 inches below flush with the breech face.

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