Sound Comparison - 150gr 300 Blackout VS 220gr Subsonic 300 Blackout | Palmetto State Armory

Published on February 10, 2026
Duration: 2:29

This video provides an audible and visual comparison between supersonic and subsonic 300 Blackout ammunition when fired through a suppressed firearm. The demonstration highlights the distinct sonic crack produced by supersonic rounds breaking the sound barrier, contrasted with the quieter report of subsonic rounds. The speaker, representing Palmetto State Armory, emphasizes that subsonic rounds are optimized for suppressed use to achieve maximum noise reduction.

Quick Summary

Subsonic 300 Blackout rounds are ideal for suppressed firearms because they travel below the speed of sound (approx. 1000 fps), eliminating the audible 'crack' produced by supersonic rounds (approx. 2000 fps) breaking the sound barrier. This maximizes noise reduction.

Chapters

  1. 00:00Intro: Supersonic vs. Subsonic 300 Blackout
  2. 00:28Test Setup & Audio Disclaimer
  3. 00:53Supersonic Round Demonstration (2000 fps)
  4. 01:24Subsonic Round Demonstration (1000 fps)
  5. 01:43Conclusion & Recommendations

Frequently Asked Questions

What is the main audible difference between supersonic and subsonic 300 Blackout rounds?

Supersonic 300 Blackout rounds produce a distinct 'crack' as they exceed the speed of sound (around 2000 fps). Subsonic rounds travel below the speed of sound (around 1000 fps) and lack this sonic crack, making them quieter, especially when suppressed.

Why are subsonic rounds ideal for suppressed firearms?

Subsonic rounds are ideal for suppressed firearms because they eliminate the sonic crack associated with supersonic bullets. This significantly reduces the overall noise signature, maximizing the effectiveness of the suppressor for the quietest possible shot.

Can I use subsonic 300 Blackout rounds effectively without a suppressor?

While technically functional, subsonic rounds are specifically designed to leverage the benefits of a suppressor by eliminating the sonic crack. Using them unsuppressed may not offer significant advantages over standard supersonic loads and misses their primary intended benefit.

What velocities are typical for supersonic and subsonic 300 Blackout ammunition?

Supersonic 300 Blackout ammunition typically travels around 2000 feet per second (fps). Subsonic 300 Blackout ammunition is designed to stay below the sound barrier, usually around 1000 feet per second (fps).

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