Grains Grains Grains!

Published on July 18, 2025
Duration: 0:55

This guide, informed by Shortshot Tony's practical demonstration, details how ammunition grain weight significantly impacts suppressed firearm performance. It highlights the audible differences between supersonic and subsonic rounds and recommends heavier grain weights for optimal sound suppression when using a suppressor. The expert-level insights are derived from direct visual and auditory comparisons during live fire tests.

Quick Summary

For optimal sound suppression with a 9mm firearm, heavier grain weight ammunition (e.g., 158 gr) is recommended. This is because heavier rounds are more likely to remain subsonic, eliminating the audible "crack" associated with supersonic projectiles, thus maximizing the effectiveness of your suppressor.

Chapters

  1. 00:00Grain Weight and Suppressors
  2. 00:07Ammunition Comparison
  3. 00:22Equipment Setup
  4. 00:28Live Fire Test
  5. 00:44Conclusion and Recommendation

Frequently Asked Questions

How does ammunition grain weight affect suppressed firearm performance?

Ammunition grain weight significantly impacts suppressed firearms by influencing whether the projectile travels at subsonic or supersonic speeds. Heavier rounds are more likely to stay subsonic, leading to much quieter shots when a suppressor is used, as the audible "crack" of supersonic rounds is minimized.

What is the difference between subsonic and supersonic 9mm ammunition when using a suppressor?

Supersonic 9mm ammunition travels faster than the speed of sound, creating an audible "crack" even with a suppressor. Subsonic 9mm ammunition travels below the speed of sound, resulting in a significantly quieter shooting experience when suppressed, as this "crack" is eliminated.

Which 9mm grain weight is best for suppressed shooting?

For optimal sound suppression, heavier grain weight 9mm ammunition, such as 158-grain rounds, is generally recommended. These heavier projectiles are more likely to remain subsonic, minimizing the noise signature compared to lighter, supersonic rounds like 115-grain ammunition.

What firearm and suppressor were used in the demonstration?

The demonstration featured a CZ Scorpion 3+ firearm equipped with a Dead Air Primal suppressor and a Holosun optic. This setup was used to audibly compare the sound signatures of different 9mm ammunition grain weights.

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