Is .338 ARC The 8.6 Blackout KILLER?

Published on April 13, 2025
Duration: 36:05

Micah Mayfield, a recognized firearms content creator, critically evaluates the .338 ARC against established calibers like 8.6 Blackout and 300 Blackout. The guide covers comprehensive testing including ballistics gel, chronograph data, and long-range trajectory, highlighting the practical challenges of magazine compatibility for the .338 ARC.

Quick Summary

Micah Mayfield critically evaluates .338 ARC against 8.6 Blackout and 300 Blackout. While .338 ARC fits the AR-15 platform and shows good expansion, its practical viability is hampered by significant magazine reliability issues. 8.6 Blackout offers greater perceived lethality due to its twist rate, and 300 Blackout remains the most practical choice.

Chapters

  1. 00:00Introduction to .338 ARC
  2. 01:27Brand Relationships and Disclosures
  3. 02:30Testing Methodology
  4. 03:21Ammunition Comparison
  5. 05:36Technical Compatibility
  6. 07:03Magazine Reliability Issues
  7. 11:09Ballistics Gel Testing
  8. 15:29Gel Results Analysis
  9. 20:04Chronograph and Long Range Testing
  10. 23:37Final Conclusion

Frequently Asked Questions

What is the primary advantage of the .338 ARC caliber?

.338 ARC is designed to fit within an AR-15 platform, offering a larger, subsonic projectile option compared to 300 Blackout while remaining compatible with AR-15 lowers and uppers, requiring only a specific barrel and bolt.

How does the .338 ARC compare to 8.6 Blackout in terms of ballistics?

.338 ARC and 8.6 Blackout exhibit nearly identical ballistic trajectories at extended ranges (up to 500 yards) and both are subsonic. However, 8.6 Blackout's faster twist rate may offer greater projectile stabilization and perceived lethality.

What are the main challenges facing the .338 ARC caliber?

.338 ARC's biggest challenge is the lack of reliable delivery systems, specifically magazines. Testing revealed frequent feeding failures with various magazine types, hindering its practical application.

Which caliber is considered the most practical among .338 ARC, 8.6 Blackout, and 300 Blackout?

The 300 Blackout is generally considered the most practical due to its widespread ammunition availability, established platform compatibility, and reliable function, despite potentially offering less terminal performance than the larger calibers.

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