Putting A Negative "Spin" on 8.6BLK

Published on July 6, 2025
Duration: 24:43

This video critically examines the 8.6 Blackout cartridge, questioning its purported advantages, particularly the emphasis on a 1:3 twist rate. The presenter argues that while the cartridge offers more energy than 300 Blackout, its significant bullet drop and limited effective range make it less ideal for hunting compared to other alternatives. The analysis delves into the physics of rotational energy, suggesting its contribution to terminal ballistics is often overstated and that faster twist rates can lead to increased barrel and component wear.

Quick Summary

The 8.6 Blackout cartridge's 1:3 twist rate, often touted for lethality, is criticized for contributing only about 4% to total muzzle energy and causing excessive barrel wear. While offering more power than 300 Blackout, its significant bullet drop and limited projectile compatibility raise questions about its practical advantages over other calibers.

Chapters

  1. 00:00Introduction to 8.6 Blackout
  2. 01:02Use Case and Selling Points
  3. 02:16Caliber Viability and Comparison
  4. 03:07Trajectory and Bullet Drop Analysis
  5. 04:14The 1:3 Twist Rate Argument
  6. 06:08Interrogating Rotational Energy
  7. 08:00Energy Calculations: Translational vs. Rotational
  8. 11:17Critique of Twist Rate Claims
  9. 11:53The 'Blender Effect' and Gel Testing
  10. 13:22Analyzing Gel Test Slow-Motion
  11. 14:17Gel Block Limitations
  12. 15:06Supersonic vs. Subsonic Performance Claims
  13. 17:25Settled Gel Block Analysis
  14. 18:33300 Grain Projectile Performance
  15. 19:35The 1:3 Twist Rate as a Gimmick
  16. 20:59Twist Rate, Stability, and Energy Transfer
  17. 21:18Consequences of 1:3 Twist Rate
  18. 22:13Projectile Limitations
  19. 23:19Conclusion and Call for Data

Frequently Asked Questions

What is the primary criticism of the 8.6 Blackout cartridge's 1:3 twist rate?

The main criticism is that the 1:3 twist rate, while increasing rotational energy, contributes negligibly to total muzzle energy (around 4%) and can lead to excessive barrel and component wear. It also severely limits projectile options, with many standard bullets not rated for the high RPMs generated.

How does 8.6 Blackout compare to 300 Blackout in terms of energy and ballistics?

8.6 Blackout offers nearly double the energy of 300 Blackout and has a higher ballistic coefficient. However, it suffers from significantly more bullet drop, making it less effective at longer ranges compared to other hunting alternatives.

Are gel tests reliable for evaluating 8.6 Blackout performance?

Gel tests, especially those using 10% blocks, can be misleading. They tend to tear more easily than flesh, exaggerating expansion and energy dump. The visual 'blender effect' might not accurately represent in-body performance, and settled gel block analysis is crucial.

What are the potential downsides of using a 1:3 twist rate with 8.6 Blackout?

A 1:3 twist rate can cause extreme barrel stress, leading to accelerated wear on the barrel, bolt face, locking lugs, and suppressors. It also necessitates specialized projectiles, as standard lead-core bullets can disintegrate at the high rotational speeds.

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