Grains Grains Grains!

Published on July 18, 2025
Duration: 0:55

This video demonstrates the audible difference between 115-grain and 158-grain 9mm ammunition when suppressed. Heavier grain weights, like the 158-grain Delta Co. Munitions, are shown to be significantly quieter and maintain subsonic velocity, making them ideal for maximum sound suppression with a suppressor like the Dead Air Primal. Lighter rounds are typically supersonic and produce a distinct crack.

Quick Summary

For optimal sound suppression with 9mm ammunition, heavier grain weights like 158gr are recommended. These projectiles are more likely to remain subsonic, eliminating the audible sonic crack and providing a quieter shooting experience when paired with a suppressor.

Chapters

  1. 00:00Grain Weight & Suppressors
  2. 00:07Ammunition Comparison: 115gr vs 158gr
  3. 00:22CZ Scorpion 3+ Setup
  4. 00:28Live Fire Test & Sound Difference
  5. 00:44Conclusion: Heavier is Quieter

Frequently Asked Questions

Does bullet grain weight matter when shooting suppressed?

Yes, grain weight significantly impacts sound suppression. Heavier grain weights (like 158gr 9mm) are more likely to remain subsonic, producing less noise and a more pleasant shooting experience with a suppressor compared to lighter, supersonic rounds.

What is the difference between subsonic and supersonic 9mm rounds?

Supersonic rounds travel faster than the speed of sound (approx. 1125 ft/s), creating a sonic crack. Subsonic rounds travel below this speed, eliminating the crack and resulting in a quieter shot, especially when suppressed.

Which 9mm ammunition is best for suppressed shooting?

For maximum sound suppression, heavier grain weight 9mm ammunition (e.g., 158gr) is generally recommended. These rounds are more likely to stay subsonic, minimizing the audible sonic crack and enhancing the effectiveness of your suppressor.

What firearm and suppressor were used in the video?

The video features a CZ Scorpion 3+ firearm equipped with a Dead Air Primal multi-purpose suppressor and a Holosun optic. This setup was used to demonstrate the sound differences between various 9mm ammunition weights.

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