224 Valkyrie - 6.5 vs 7 Twist Head-To-Head Range Test

Published on September 3, 2018
Duration: 37:27

This head-to-head range test compares 1:7 and 1:6.5 twist barrels for the .224 Valkyrie cartridge using heavy projectiles. Contrary to common assumptions, the 1:7 twist barrel demonstrated surprising stability with the 95gr Sierra MatchKing and 90gr SMK, even outperforming the 1:6.5 twist in some instances. The test also highlighted issues with brass longevity and primer pocket looseness at high pressures.

Quick Summary

The 1:7 twist barrel proved capable of stabilizing heavy .224 Valkyrie projectiles like the 95gr Sierra MatchKing and 90gr SMK, sometimes outperforming the 1:6.5 twist. However, reloading .224 Valkyrie presents challenges like extreme powder compression and short brass life due to high pressures.

Chapters

  1. 00:00Intro: .224 Valkyrie Twist Rate Debate
  2. 01:26Hardware & Test Setup: White Oak Armament Barrels
  3. 02:55Bullet Selection & Stability Theory
  4. 06:43How to Identify Unstable Bullets
  5. 08:0695gr Sierra MatchKing Results: 1:7 vs 1:6.5
  6. 11:3290gr JLK & 90gr SMK Tests
  7. 17:28Reloading Challenges: Seating Dies & Compression
  8. 19:43Factory Ammo Performance: Fusion & SMK
  9. 24:33Brass Longevity & Loose Primer Pockets

Frequently Asked Questions

Does a 1:7 twist barrel stabilize heavy .224 Valkyrie bullets?

Yes, surprisingly. In this test, the 1:7 twist barrel successfully stabilized the 95gr Sierra MatchKing and the 90gr Sierra MatchKing, even outperforming the 1:6.5 twist in some specific load configurations.

What are the common reloading issues with .224 Valkyrie?

Reloaders often face extreme powder compression, which can damage seating dies and lead to inconsistent bullet seating. Additionally, brass longevity is a concern, with primer pockets becoming loose after only a few firings due to high operating pressures.

How can you tell if a bullet is unstable in flight?

Unstable bullets will create non-circular or oblong holes on the target, often with a 'grease mark' indicating tumbling. Round holes, even if large, suggest the bullet was flying point-forward, indicating stability.

Which twist rate is better for heavy .224 Valkyrie bullets?

While 1:6.5 is often recommended for heavier bullets, this test showed the 1:7 twist can also stabilize them effectively, sometimes even better. Factors like bullet design, velocity, and specific load development play a significant role.

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