6GT Handloads Vs. Factory With a Tuner Brake?

Published on June 14, 2026
Duration: 9:56

This video demonstrates the performance of the 6 GT cartridge in a precision rifle setup, featuring a Terminus Zeus action, Proof Steel barrel, and an EC Tuner Brake. The presenter highlights the effectiveness of factory ammunition, specifically Hornady 109gr ELDM, when tuned with the EC brake, achieving sub-half-inch groups and impressive ballistic consistency with single-digit SDs and sub-20 extreme spreads. The review emphasizes the rifle's accuracy and the tuner brake's ability to optimize factory loads for competitive shooting.

Quick Summary

The 6 GT precision rifle build features a Terminus Zeus action, Proof Steel barrel, and an EC Tuner Brake. Hornady 109gr ELDM factory ammo achieved 2990 fps and, when tuned with the brake, tightened groups from 0.5 inches to 0.2-0.3 inches with SDs of 6-7.

Chapters

  1. 00:00Introduction: 6 GT Rifle Build
  2. 00:06Rifle Components: Terminus, Proof, EC Tuner
  3. 00:20Optics and Stock: Zero Compromise, Foundation
  4. 00:35Ammunition: Hornady 109gr ELDM and Velocity
  5. 00:45Target Setup and Shooting Position
  6. 01:07Initial Groups with Factory Ammo
  7. 01:18Tuner Brake Adjustment and Group Tightening
  8. 01:37Ballistics Data: SD and ES of Factory Ammo
  9. 01:54Shooting at 300 Yards: Wind Call and Accuracy
  10. 02:06Consistent Grouping and Performance
  11. 02:17Range Limitations and Future Plans
  12. 02:35Video Purpose: Zeroing and 6 GT Discussion
  13. 02:48Rifle, Rest, and Ammunition Strategy
  14. 02:51Handloading vs. Tuned Factory Ammo Debate
  15. 03:03Targeting Small Targets at 300 Yards
  16. 03:28Impact of Ammunition Lot Changes
  17. 03:41Precision Shooting and Minor Adjustments
  18. 04:03Positional Shooting and Zero Adjustments
  19. 04:23Targeting Different Colored Gong
  20. 04:35Evaluating Shot Placement and Adjustments
  21. 04:59Dueling Tree Engagement
  22. 05:03Conclusion: Accurate Rifles are Interesting
  23. 05:07Call to Action: Like, Subscribe, and Check Out Col-Tec
  24. 05:28Final Thoughts on Factory Ammo and Tuner Brakes
  25. 05:44Closing Remarks and Next Video

Frequently Asked Questions

What rifle components are used in the 6 GT precision build?

The build features a Terminus Zeus short action, a Proof Steel barrel with a 1:7.5 twist rate, an EC Tuner Brake from Eric Cortina, a Zero Compromise 5-27x56 scope in a Spur mount, and a Foundation stock.

How does the EC Tuner Brake affect factory ammunition performance?

The EC Tuner Brake significantly improves the accuracy of factory ammunition. Initially, groups were around 0.5 inches, but after tuning, they tightened to approximately 0.2-0.3 inches, demonstrating its effectiveness in optimizing loads.

What are the ballistic characteristics of the Hornady 109gr ELDM factory ammo used?

The Hornady 109gr ELDM factory ammunition achieved a velocity of about 2990 fps. It demonstrated excellent consistency with a standard deviation (SD) of 6-7 and an extreme spread (ES) below 20.

Is handloading necessary for precision shooting with a 6 GT?

The presenter suggests that for many shooters, handloading may not be necessary. With a rifle that shoots factory ammo well and a tuner brake, exceptional accuracy with consistent ballistics can be achieved, making factory loads a viable and effective option.

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