Suppressors 101 | Episode 7 - Ammo Types & Suppressors | Palmetto State Armory

Published on January 3, 2026
Duration: 4:56

This video from Palmetto State Armory's 'Suppressors 101' series, hosted by Justin, explains the critical differences between subsonic and supersonic ammunition when using suppressors. It details how subsonic rounds maximize noise reduction by staying below the 1100 FPS transonic barrier, while supersonic rounds produce an audible crack. The guide emphasizes the importance of proper ammunition selection to ensure complete powder burn and prevent malfunctions, especially with reduced back pressure suppressors.

Quick Summary

Subsonic ammunition travels below 1100 FPS, maximizing noise reduction with suppressors. Supersonic ammo creates a sonic crack. Proper back pressure is crucial for subsonic rounds to ensure complete powder burn and prevent malfunctions, necessitating more frequent cleaning due to powder residue.

Chapters

  1. 00:00Introduction to Suppressor Ammo Types
  2. 00:26Sources of Suppressed Shooting Sound
  3. 00:49Understanding Subsonic Ammunition
  4. 01:21Understanding Supersonic Ammunition
  5. 01:53Powder Burn and Back Pressure Dynamics
  6. 02:15Risks of Subsonic Ammo with RBP Suppressors
  7. 03:02Maintenance for Subsonic Ammo Users

Frequently Asked Questions

What is the main difference between subsonic and supersonic ammunition when using a suppressor?

Subsonic ammunition travels below the speed of sound (approx. 1100 FPS), maximizing noise reduction. Supersonic ammunition travels faster, creating an audible sonic crack that suppressors cannot eliminate, though they do reduce gas noise.

Why is back pressure important when shooting subsonic ammunition suppressed?

Subsonic ammunition often uses slower-burning powder. Sufficient back pressure from the firearm and suppressor ensures this powder burns completely, preventing unburnt residue and potential malfunctions.

Can suppressors eliminate all noise from a gunshot?

No, suppressors primarily reduce the noise from escaping gases. They cannot eliminate the supersonic crack produced by a bullet traveling faster than the speed of sound.

What are the common calibers for subsonic ammunition?

Common calibers for subsonic ammunition include .300 Blackout, 9mm, and 7.62x39. These are often chosen for their effectiveness in suppressed applications where noise reduction is prioritized.

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