First Shots | 300 Blackout Build

Published on November 3, 2024
Duration: 19:26

This video details the first shots fired from a custom 300 Blackout AR build, featuring a YHM Resonator K suppressor. The presenter compares the performance of 125-grain supersonic and 208-grain subsonic ammunition, noting differences in recoil, sound, and grouping at various distances. The build is evaluated for reliability, with minor malfunctions addressed, and the overall suppressed shooting experience is highlighted as a significant improvement.

Quick Summary

When shooting a suppressed 300 Blackout, subsonic ammunition like 208-grain rounds offers a more comfortable experience with less recoil and a quieter report compared to supersonic 125-grain rounds. Shorter suppressors ('K' models) provide compactness but slightly less sound suppression than longer variants.

Chapters

  1. 00:00Introduction to the 300 Blackout Build
  2. 00:34Installing the YHM Resonator K Suppressor
  3. 01:15Ammunition Selection: Supersonic vs. Subsonic
  4. 02:37First Shots: Supersonic Ammunition at 10 Yards
  5. 03:58Target Analysis: Supersonic Groupings
  6. 05:02Shooting Subsonic Ammunition
  7. 06:15Target Analysis: Subsonic Groupings
  8. 07:05The Benefits of Suppressed Shooting
  9. 07:16Understanding 'K' Suppressors
  10. 08:45Aesthetic Appreciation of the Build
  11. 09:25Mixed Mag: Supersonic and Subsonic Comparison
  12. 10:10Malfunction: Failure to Eject
  13. 11:11Continuing with Supersonics, then Switching to Subs
  14. 12:42Shooting at 15 Yards: Subsonic Ammunition
  15. 13:01Malfunction: Failure to Feed
  16. 14:26Shooting at 20 Yards: Mag Dump
  17. 16:39Target Analysis: 20 Yards Groupings
  18. 18:36Final Thoughts on the 300 Blackout Build
  19. 19:21Conclusion and Sign-off

Frequently Asked Questions

What are the key differences between supersonic and subsonic 300 Blackout ammunition when suppressed?

When suppressed, subsonic 300 Blackout ammunition generally offers less felt recoil and a quieter report compared to supersonic rounds. The presenter found the 208-grain subsonic rounds more comfortable to shoot than the 125-grain supersonic rounds, with similar grouping performance.

What is the purpose of a 'K' designation on a suppressor like the YHM Resonator K?

The 'K' designation on a suppressor typically indicates a shorter, more compact design. While this offers advantages in size and weight, it generally means slightly less sound suppression compared to longer suppressors of the same model.

What types of malfunctions were observed during the first shots with the 300 Blackout build?

During the initial firing sessions, the presenter experienced a failure to eject a casing and a failure to feed. These issues were noted, and the firearm was subsequently lubricated to address potential reliability concerns.

How does barrel length affect 300 Blackout performance?

The complete powder burn for 300 Blackout is estimated to be around 9 inches. Barrels shorter than this, such as the 7.5-inch barrel on this build, may not achieve full powder combustion, which can influence velocity and overall performance.

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