300 Blackout - Picking better powders to fix my gas problems

Published on September 29, 2022
Duration: 31:23

This video provides expert guidance on resolving gas system issues in a suppressed 300 Blackout rifle by strategically selecting powders. The instructor demonstrates how to pair 'gassier' powders for subsonics with 'less gassy' powders for supers to achieve reliable function across both ammunition types. Key takeaways include understanding powder burn rates, adjusting the gas block, and testing combinations for optimal performance.

Quick Summary

To fix gas problems in a suppressed 300 Blackout, strategically select powders based on their burn rate. Use 'gassier' (slower burning) powders like Shooters World Blackout for subsonics to ensure reliable cycling, and 'less gassy' (faster burning) powders like Alliant 2400 for supers to prevent over-gassing. This approach optimizes gas pressure for each load type.

Chapters

  1. 00:00Introduction: The Gas Problem
  2. 00:48Initial Troubleshooting Attempts
  3. 01:25The Mandate: Flawless Subs & Supers
  4. 01:41Powder Selection Strategy: Burn Rate
  5. 02:55Fast vs. Slow Burning Powders Explained
  6. 03:40Ideal Powder Combinations for 300 BLK
  7. 04:15Testing Plan: Subsonic & Supersonic Loads
  8. 05:06Bullet Selection for Testing
  9. 06:28Primer Choice: CCI #41
  10. 07:25Brass Preparation
  11. 08:25Loading First Test Rounds
  12. 09:48Range Test 1: Shooters World Blackout & Alliant 2400
  13. 11:11Gas Block Adjustment & Function Testing
  14. 13:20Range Test 2: Winchester 296 Subs & Supers
  15. 16:51Analyzing Winchester 296 Results
  16. 17:58Further Testing: Velocity & Function
  17. 20:44Testing Vltavory N120 Subs & N110 Supers
  18. 21:29Trigger Issues & Gas Block Mystery
  19. 23:09Testing Accurate 5744 Subs & Accurate #9 Supers
  20. 24:33High Gas Setting Test
  21. 26:21Consolidating Results: Gas Block Settings
  22. 28:01Final Test: Mixed Loads & Suppressor Check
  23. 30:00Testing Without Suppressor
  24. 31:37Conclusion: Success & Takeaways
  25. 33:32Final Thoughts & Future Videos

Frequently Asked Questions

What is the main cause of gas problems with suppressed 300 Blackout loads?

Gas problems, particularly over-gassing with supersonic loads, often stem from using powders with burn rates that are too fast for the cartridge and barrel length, especially when suppressed. This leads to excessive pressure and gas entering the action, preventing proper cycling.

How can powder selection fix gas issues in a 300 Blackout?

By selecting 'gassier' (slower burning) powders for subsonic loads and 'less gassy' (faster burning) powders for supersonic loads, you can optimize gas pressure for each. This ensures enough gas for subsonics to cycle the action and prevents over-gassing with supers.

What are good powder choices for subsonic 300 Blackout loads?

For subsonic 300 Blackout loads, slower burning powders that produce more gas are generally recommended. Examples include Shooters World Blackout, Vitavory N120, Accurate #1680, and Accurate #5744. These help ensure reliable cycling when suppressed.

What are good powder choices for supersonic 300 Blackout loads?

For supersonic 300 Blackout loads, faster burning powders are often preferred as they match the cartridge's pressure curve well and produce less gas, preventing over-cycling. Popular choices include Winchester 296, Alliant H110, Accurate #9, and Vitavory N110.

How do you tune an adjustable gas block for 300 Blackout subsonics and supers?

For subsonics, adjust the gas block until the bolt reliably locks open on an empty magazine. For supers, test with a setting that ensures reliable cycling without over-gassing. Finding a common gas block setting that works for both is key, often achieved by pairing appropriate powders.

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