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

Published on September 3, 2018
Duration: 37:27

This guide details a head-to-head range test comparing 1:7 and 1:6.5 twist barrels for the .224 Valkyrie cartridge, focusing on projectile stability with heavy bullets. The expert demonstrates how to identify bullet yawing by analyzing target holes and discusses reloading challenges and brass longevity. The analysis reveals surprising results regarding the stabilization capabilities of different twist rates with specific heavy projectiles.

Quick Summary

A head-to-head test comparing 1:7 and 1:6.5 twist barrels for the .224 Valkyrie revealed surprising results. The 1:7 twist barrel effectively stabilized the 95gr Sierra MatchKing, outperforming the 1:6.5 twist in some tests. The analysis also highlighted issues with bullet instability identification and reloading challenges like brass longevity and seating die compression.

Chapters

  1. 00:00Twist Rate Debate in 224 Valkyrie
  2. 01:26Hardware and Test Setup
  3. 02:55Bullet Selection and Stability Theory
  4. 06:43Identifying Instability
  5. 08:0695gr Sierra MatchKing Results
  6. 11:3290gr JLK and 90gr SMK Tests
  7. 17:28Reloading Challenges: Seating Dies and Compression
  8. 19:43Factory Ammo Performance
  9. 24:33Brass Longevity and Loose Primer Pockets

Frequently Asked Questions

What is the main debate regarding barrel twist rates for the .224 Valkyrie cartridge?

The primary debate centers on whether a 1:7 twist rate, initially recommended by Federal, is sufficient for stabilizing heavy projectiles, or if a faster 1:6.5 twist is necessary, as many shooters have found the 1:7 struggles with longer bullets.

How can bullet instability be identified on a target?

Bullet instability, or yawing, can be identified by non-circular or oblong bullet holes on stiff targets. Stable bullets will produce round holes, even if the overall group size is large due to other factors.

What reloading challenges were encountered with the .224 Valkyrie?

Reloaders experienced issues with broken seating stems in dies due to extreme powder compression. Additionally, brass longevity is a concern, with primer pockets becoming loose after only a few firings, indicating high operating pressures.

Which twist rate performed better with the 95gr Sierra MatchKing in the test?

Surprisingly, the 1:7 twist barrel stabilized the 95gr Sierra MatchKing effectively, producing a tighter group (1.017") compared to the 1:6.5 twist barrel (1.263") in high-velocity testing with Hodgdon H414 powder.

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