338 ARC Supersonic vs Subsonic | CMMG DISSENT w/ YHM Bad Larry Silencer Shop

Published on July 20, 2025
Duration: 0:42

This video provides a direct comparison between supersonic and subsonic 338 ARC ammunition fired from a CMMG Dissent rifle equipped with a YHM Bad Larry suppressor. The presenter highlights the significant audible difference between the two ammunition types, noting it's 'night and day'. The test was conducted with support from Silencer Shop and Hornady.

Quick Summary

The audible difference between supersonic and subsonic 338 ARC ammunition is significant, described as 'night and day'. Fired from a CMMG Dissent with a YHM Bad Larry suppressor, subsonic rounds offer a much quieter shooting experience compared to their supersonic counterparts.

Chapters

  1. 00:00Introduction and Gear Setup
  2. 00:10Ammunition Supplier Credit
  3. 00:16Supersonic vs. Subsonic Plan
  4. 00:27Firing Supersonic Rounds
  5. 00:34Firing Subsonic Rounds
  6. 00:40Sound Comparison Conclusion

Frequently Asked Questions

What is the primary difference between supersonic and subsonic 338 ARC ammunition?

The primary difference lies in their velocity relative to the speed of sound. Supersonic rounds travel faster than sound, creating a sonic boom, while subsonic rounds travel slower than sound. This results in a significant audible difference, especially when suppressed, with subsonic rounds being much quieter.

What firearm and suppressor were used in the 338 ARC ammunition test?

The test utilized a CMMG Dissent rifle chambered in .338 ARC. It was equipped with a YHM Bad Larry suppressor, which is a key component in demonstrating the sound reduction capabilities of subsonic ammunition.

How was the comparison between supersonic and subsonic 338 ARC conducted?

The comparison involved a direct test where five rounds of supersonic 338 ARC ammunition were fired, followed by five rounds of subsonic 338 ARC ammunition. This sequential firing allowed for a clear, side-by-side audible comparison of the two ammunition types.

Who supplied the ammunition and support for the 338 ARC test?

Hornady was the supplier of the .338 ARC ammunition used in this comparison test. Silencer Shop also provided support for the setup and execution of the demonstration.

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