338 ARC vs 8.6 Blackout: Worse Than I Thought

Published on February 28, 2025
Duration: 14:29

The 8.6 Blackout significantly outperforms the .338 ARC in barrier penetration, demonstrating superior performance against concrete and mild steel. Its 1:3 twist rate enables impressive bullet expansion and wound cavities, especially with subsonic loads, while the .338 ARC struggles in these areas. The 8.6 Blackout also benefits from standard AR-10 magazine compatibility, offering higher capacity than the .338 ARC's reliance on .400 Legend magazines.

Quick Summary

The 8.6 Blackout significantly outperforms the .338 ARC in barrier penetration, easily punching through concrete blocks where the .338 ARC shatters. Its 1:3 twist rate enables superior bullet expansion, especially with subsonic rounds, creating larger wound cavities compared to the .338 ARC.

Chapters

  1. 00:00Introduction & Supersonic Comparison
  2. 00:25Muzzle Energy Testing
  3. 02:13Concrete Block Penetration Test
  4. 03:13Mild Steel Barrier Testing
  5. 06:02Sandbox & Subsonic Performance
  6. 09:09Twist Rate & Bullet Expansion Explained
  7. 09:45Ballistic Gel Wound Channel Comparison
  8. 11:57Suppressor Performance & Noise Levels
  9. 13:43Final Assessment & Limitations

Frequently Asked Questions

How does the 8.6 Blackout compare to the .338 ARC in barrier penetration?

The 8.6 Blackout significantly outperforms the .338 ARC in barrier penetration. Testing showed the 8.6 Blackout punching clean holes through concrete blocks, while the .338 ARC shattered. Against mild steel, the 8.6 Blackout also demonstrated superior performance.

What is the key factor enabling the 8.6 Blackout's superior bullet expansion?

The 8.6 Blackout's 1:3 twist rate is crucial. This rapid twist generates approximately 240,000 RPM, enabling effective bullet expansion even at lower velocities, especially with subsonic loads, unlike the .338 ARC's slower 1:8 twist.

Which caliber offers better subsonic performance in testing?

The 8.6 Blackout demonstrated superior subsonic performance. A 342-grain subsonic 8.6 Blackout round successfully penetrated a sandbox and plywood barrier, whereas a 300-grain subsonic .338 ARC round failed to exit the sand.

What are the practical platform differences between .338 ARC and 8.6 Blackout?

The .338 ARC often utilizes .400 Legend magazines, limiting its capacity. In contrast, the 8.6 Blackout typically uses standard AR-10 magazines, providing a higher and more common ammunition capacity.

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