.300 Blackout vs 9mm | Real-World Penetration Test (Drywall, Cars & More!)

Published on September 22, 2025
Duration: 28:21

This comprehensive test, led by experienced firearms instructors from Classic Firearms, compares the real-world penetration of 9mm and .300 Blackout ammunition. Using common barriers like drywall, car doors, and Level 3A body armor, the video provides critical insights into terminal ballistics and over-penetration risks relevant to self-defense and law enforcement applications. The expert analysis emphasizes shot placement and target awareness due to the significant energy differences observed.

Quick Summary

In a real-world penetration test, .300 Blackout rounds demonstrated superior barrier penetration through drywall and studs compared to 9mm. While both calibers penetrated car doors easily, Level 3A body armor stopped all tested rounds, though with significant backface deformation. Defensive 9mm ammunition showed controlled expansion, reducing over-penetration risks compared to FMJ.

Chapters

  1. 00:00Introduction: 9mm vs .300 Blackout Debate
  2. 00:30Ammunition Selection
  3. 01:28Test Setup and Barriers
  4. 02:479mm Drywall Penetration Test
  5. 04:389mm Wall Stud Impact
  6. 06:03300 Blackout Drywall and Stud Test
  7. 08:55Car Door Penetration Results
  8. 11:32Body Armor Performance: Guard Dog Level 3A
  9. 19:02Studio Breakdown and Final Thoughts

Frequently Asked Questions

How does .300 Blackout compare to 9mm in drywall penetration?

.300 Blackout rounds, both supersonic and subsonic, cause significantly more destruction to drywall than 9mm. Subsonic .300 Blackout rounds were observed to tumble after impact, creating larger, irregular holes, while supersonic rounds delivered immense energy.

What is the ballistic protection offered by a car door?

A car door provides minimal ballistic protection. Both 9mm and .300 Blackout rounds easily penetrated the exterior and interior panels of the tested Honda car door, demonstrating that vehicles should be considered concealment rather than reliable cover.

Can Level 3A body armor stop .300 Blackout rounds?

Yes, a Level 3A Guard Dog Body Armor plate successfully stopped multiple rounds of both 9mm and .300 Blackout (supersonic and subsonic). However, significant backface deformation was observed, indicating potential for blunt force trauma.

Which ammunition is better for home defense: 9mm FMJ or Speer Gold Dot?

For home defense, Speer Gold Dot 9mm defensive rounds are preferable to FMJ. The Gold Dot demonstrated controlled expansion, reducing the risk of over-penetration, whereas FMJ rounds pose a higher risk of passing through multiple barriers and potentially harming unintended targets.

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