Twist rate in ten minutes

Published on August 1, 2015
Duration: 10:08

This guide, presented by an experienced firearms instructor from Regular Guy Training LLC, clarifies the concept of twist rate in AR-15 style rifles. It explains how twist rate affects bullet stabilization and accuracy with different bullet weights (55gr, 62gr, 77gr) and provides a compatibility guide for common twist rates (1:7, 1:8, 1:9) and ammunition.

Quick Summary

Twist rate on an AR-15 barrel indicates the distance in inches for a bullet to complete one rotation. Common rates (1:7, 1:8, 1:9) impact bullet stabilization, especially at ranges over 300 yards. Heavier bullets (77gr) need faster twists (1:7), while lighter ones (55gr) suit slower twists (1:9).

Chapters

  1. 00:00Introduction to Twist Rate
  2. 01:00Defining Twist Rate Notation
  3. 02:50Common Bullet Weights
  4. 05:40Ballistic Stability and Accuracy
  5. 08:30Twist Rate Compatibility Guide

Frequently Asked Questions

What is twist rate on an AR-15 barrel?

Twist rate on an AR-15 barrel refers to the distance in inches the bullet travels inside the barrel to complete one full rotation. Common rates include 1:7, 1:8, and 1:9 inches per rotation.

How does twist rate affect AR-15 accuracy?

Twist rate affects accuracy by stabilizing the bullet. Heavier bullets require faster twists (e.g., 1:7) for stability at range, while lighter bullets (e.g., 55gr) are better suited for slower twists (e.g., 1:9) to avoid over-stabilization.

What is the best twist rate for 5.56 NATO ammunition?

The best twist rate depends on the bullet weight. A 1:9 is good for 55gr/62gr, 1:8 is versatile for all common weights, and 1:7 is optimal for heavier 77gr rounds.

Which bullet weights are common for 5.56 NATO?

Common 5.56 NATO bullet weights include 55 grain (like XM193), 62 grain (like M855), and 77 grain (like MK262). The 55gr was the original standard.

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