Which is more accurate? 1:12 or 1:7 Twist Rate? Let's find out!

Published on February 8, 2024
Duration: 16:07

This video compares the accuracy and performance of 1:12 and 1:7 twist rate barrels in AR-15 platforms. Testing reveals that the 1:7 twist rate is more versatile, stabilizing both lighter 55gr and heavier 62gr bullets effectively. Conversely, the 1:12 twist rate shows a significant accuracy degradation with heavier 62gr projectiles, making it best suited for clone builds using lighter ammunition.

Quick Summary

The 1:7 twist rate barrel is more versatile for AR-15s, effectively stabilizing both 55gr and 62gr bullets, resulting in comparable accuracy. In contrast, a 1:12 twist barrel shows poor stabilization and accuracy degradation with heavier 62gr projectiles, making it suitable only for lighter ammunition.

Chapters

  1. 00:10Understanding Rifle Twist Rates
  2. 02:48Testing 1:7 Twist with 55gr & 62gr Ammo
  3. 06:26Testing 1:12 Twist with 55gr & 62gr Ammo
  4. 09:46Muzzle Velocity Comparison
  5. 13:37Final Conclusions: Which Twist Rate is Best?

Frequently Asked Questions

What is the difference between a 1:12 and 1:7 twist rate in an AR-15 barrel?

A 1:12 twist rate means the barrel's rifling completes one full rotation every 12 inches. A 1:7 twist rate completes one rotation every 7 inches. The faster 1:7 twist is designed to stabilize heavier bullets, while the slower 1:12 is typically for lighter projectiles.

Which twist rate is more accurate for AR-15s with different bullet weights?

The 1:7 twist rate is generally more accurate across a wider range of bullet weights, including heavier 62gr rounds. The 1:12 twist rate performs well with 55gr bullets but shows a significant accuracy drop with 62gr projectiles.

Does twist rate affect bullet velocity?

Yes, a slower twist rate like 1:12 can result in slightly higher muzzle velocity compared to a faster 1:7 twist when using the same ammunition, likely due to reduced rotational friction.

When should I choose a 1:12 twist barrel over a 1:7 twist barrel?

A 1:12 twist barrel is best suited for clone-correct builds or when you exclusively plan to shoot 55gr or lighter ammunition. For versatility with various bullet weights, the 1:7 twist is the superior choice.

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