Building My 300 PRC : Part - 2 The Barrel

Published on January 6, 2026
Duration: 12:53

This video documents the process of building a custom 300 PRC rifle barrel, focusing on the use of a Helix 6 Precision carbon fiber wrapped barrel. The expert demonstrates precision machining techniques, including CNC work, manual truing, chambering, and headspace verification. The build aims for a balance of hunting practicality and competition compliance, adhering to weight regulations under 16 pounds.

Quick Summary

Building a custom 300 PRC rifle barrel involves precision machining: CNC threading, manual truing, chambering with a 300 PRC reamer, and headspace verification using go/no-go gauges. Helix 6 carbon fiber barrels allow for muzzle threading after turning down the carbon wrap.

Chapters

  1. 00:00Introduction and Disclaimer
  2. 00:46Build Goals and Regulations
  3. 02:43Helix 6 Precision Visit
  4. 03:30CNC Threading and Manual Machining
  5. 04:38Chambering and Headspacing
  6. 06:34Barrel Length Selection
  7. 07:31Muzzle Threading
  8. 09:12Crowning and Action Assembly
  9. 10:26Laser Engraving and Trigger Installation

Frequently Asked Questions

What are the key steps in building a custom 300 PRC rifle barrel?

The process involves selecting a barrel blank, CNC machining for thread pitch, manual truing for runout, chambering with a 300 PRC reamer, verifying headspace with gauges, cutting to length, threading the muzzle, crowning, and assembling with the action and trigger.

What are the advantages of a Helix 6 Precision carbon fiber barrel for a 300 PRC build?

Helix 6 carbon fiber barrels start as blanks and allow the carbon wrap to be turned down at the muzzle for threading. This design facilitates muzzle device installation without compromising the barrel's structural integrity.

How is headspace checked during rifle barrel construction?

Headspace is checked using go/no-go gauges. A 'go' gauge should allow the bolt to close, while a 'no-go' gauge should prevent it. A slight adjustment, or 'fudge factor,' may be added for reliable function with factory ammunition.

What are the weight requirements for hunting rifles in Idaho?

Idaho Fish and Game regulations stipulate that hunting rifles must weigh under 16 pounds. This weight limit also aligns with NRL Hunter competition rules for the heavy class.

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