How to Determine the Rate of Twist in a Rifle Barrel Presented by Larry Potterfield of MidwayUSA

Published on July 20, 2011
Duration: 1:31

This video demonstrates a practical method for determining the rate of twist in a rifle barrel using simple tools. Larry Potterfield of MidwayUSA explains the importance of matching bullet weight to twist rate for optimal accuracy. The process involves inserting a cleaning rod, marking its position, rotating it one full turn within the rifling, and measuring the distance traveled to calculate the twist rate.

Quick Summary

The rate of twist in a rifle barrel is the distance in inches a bullet travels to complete one full 360-degree revolution. To measure it, insert a cleaning rod with a patch, mark its position, rotate it one full turn within the rifling, and measure the distance traveled. This is crucial for matching bullet weight to barrel twist for optimal accuracy.

Chapters

  1. 00:00Introduction to Barrel Twist Rate
  2. 00:33Preparation and Initial Measurement
  3. 00:54Measuring the Revolution
  4. 01:08Calculating the Twist Rate

Frequently Asked Questions

What is the rate of twist in a rifle barrel?

The rate of twist refers to the distance, measured in inches, that a bullet travels inside the barrel to complete one full 360-degree revolution. For example, a 1:10 twist means the bullet makes one turn in every 10 inches of barrel length.

Why is the rate of twist important for rifle accuracy?

Matching the bullet's weight and design to the barrel's rate of twist is critical for accuracy. An appropriate twist rate stabilizes the bullet effectively, ensuring it travels predictably and hits the target consistently.

How can I measure the twist rate of my rifle barrel?

You can measure it by inserting a cleaning rod with a tight patch and jag into the bore. Mark the rod, rotate it one full turn while engaging the rifling, and measure the distance the rod traveled. This distance is your twist rate (e.g., 1:10 inches).

What tools are needed to measure barrel twist rate?

You'll need a cleaning rod that fits snugly in the bore, a tight-fitting jag and patch, a tape flag or marker to indicate rotation, and a measuring tool like a yardstick or tape measure to determine the distance.

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