300 Blk - 225gr Hornady BTHP Match subsonics

Published on January 7, 2017
Duration: 36:48

This video details a comprehensive test of 225gr Hornady BTHP Match subsonic 300 Blackout ammunition across two different barrel lengths (8.5-inch SBR and 16-inch rifle) using Accurate 1680 and Reloader 7 powders. The instructor meticulously outlines the process of developing and testing loads, focusing on velocity, function, and accuracy to identify optimal subsonic performance.

Quick Summary

Expert load development for 300 Blackout subsonic ammunition using 225gr Hornady BTHP Match bullets is detailed, focusing on Accurate 1680 and Reloader 7 powders. Testing across an 8.5-inch SBR and 16-inch rifle revealed the SBR achieved exceptional accuracy (0.6" groups), while the 16-inch rifle performed moderately. Functional issues with Reloader 7 were noted on the carbine gas system.

Chapters

  1. 00:01Introduction to 300 Blackout Subsonic Testing Series
  2. 00:20Testing the 225gr Hornady BTHP Match Bullet
  3. 01:00Firearm Configurations: 8.5" SBR vs 16" Rifle
  4. 01:19Powder Selection: Accurate 1680 and Reloader 7
  5. 01:52Brass and Primers: Lake City 5.56 and CCI #41
  6. 02:21Initial Velocity Exploration Rounds
  7. 03:00Accurate 1680 Charge Weight Range
  8. 03:20Reloader 7 Charge Weight Range
  9. 03:51Bullet Seating and Overall Length
  10. 06:00Factory Crimp Application
  11. 06:47Shooting the 8.5" SBR - Initial Velocity Tests
  12. 09:308.5" SBR with Reloader 7 - Initial Velocity Tests
  13. 10:22Shooting the 16" Rifle - Initial Velocity Tests
  14. 11:3616" Rifle with Reloader 7 - Initial Velocity Tests
  15. 12:30Bullet Hole Analysis and Functionality Review
  16. 13:09Data Analysis and Load Selection Strategy
  17. 14:17Load Selection for 8.5" Barrel with Accurate 1680
  18. 14:20Load Selection for 8.5" Barrel with Reloader 7
  19. 14:54Load Selection for 16" Barrel with Accurate 1680
  20. 16:06Load Selection for 16" Barrel with Reloader 7
  21. 17:20Reloading Process for Accuracy Testing
  22. 17:51Accuracy Testing - 8.5" SBR with Reloader 7
  23. 20:19Accuracy Testing - 8.5" SBR with Accurate 1680
  24. 22:03Accuracy Testing - 8.5" SBR with Reloader 7 (Continued)
  25. 23:07Accuracy Testing - 16" Rifle with Accurate 1680
  26. 25:19Accuracy Testing - 16" Rifle with Reloader 7
  27. 26:40Post-Range Analysis and Group Review
  28. 27:32Comparison with Previous Bullet Tests (Match Kings)
  29. 29:298.5" SBR Performance with 225gr Hornady
  30. 32:3916" Rifle Accuracy Data and Winner Selection
  31. 35:20Bullet Hole Elongation Clues
  32. 36:35Conclusion and Final Thoughts

Frequently Asked Questions

What powders are recommended for developing 300 Blackout subsonic loads with 225gr Hornady BTHP Match bullets?

The video recommends Accurate 1680 and Reloader 7 for developing 300 Blackout subsonic loads with 225gr Hornady BTHP Match bullets. Specific charge weight ranges were tested for each powder in both an 8.5-inch SBR and a 16-inch rifle configuration.

How does the 8.5-inch SBR perform with 225gr Hornady BTHP Match subsonic 300 Blackout loads?

The 8.5-inch SBR demonstrated excellent accuracy with the 225gr Hornady BTHP Match subsonic loads, achieving groups as small as 0.6 inches. Reloader 7 at 10.9 grains was identified as a potential optimal load for this configuration.

What were the results of testing 225gr Hornady BTHP Match subsonic loads in a 16-inch 300 Blackout rifle?

The 16-inch rifle showed less impressive accuracy with the 225gr Hornady BTHP Match subsonic loads, with groups typically ranging from 1.5 to 2.5 inches. Accurate 1680 at 11.2 grains was selected as the winning load for this configuration.

Were there any functional issues observed during the 300 Blackout subsonic load testing?

Yes, the 16-inch rifle with a carbine gas system experienced bolt lock-back issues with Reloader 7 at lower charge weights. Accurate 1680 generally provided reliable function across both firearm configurations.

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