Does Winter Clothing Affect Your Self Defense Ammo?! (FMJ vs JHP)

Published on February 6, 2026
Duration: 19:03

This video provides a practical, experimental guide to understanding how winter clothing can impede self-defense ammunition performance. The host, demonstrating high authority in tactical gear and ammunition testing, uses ballistic gel to show that common JHP rounds in .380 ACP and 9mm Luger often fail to expand when fired through heavy clothing, leading to over-penetration. The 10mm Auto is highlighted as a caliber that can maintain expansion under these conditions.

Quick Summary

Winter clothing can significantly hinder self-defense ammunition performance by clogging hollow point cavities, preventing expansion. Tests show .380 ACP and 9mm Luger JHPs failed to expand through heavy layers, behaving like FMJ rounds with deep penetration. The 10mm Auto JHP was the only round to reliably expand.

Chapters

  1. 00:00Introduction: Testing Ammo Performance
  2. 01:33Testing Setup: Ballistic Gel & Ammo
  3. 03:04Baseline: Bare Gel Testing
  4. 07:41Winter Clothing Setup
  5. 09:04Clothing Test: .380 and 9mm Results
  6. 12:12Clothing Test: .45 ACP and 10mm Results
  7. 15:56Bonus Test: 9mm FMJ
  8. 17:45Conclusion: Bullet Comparison

Frequently Asked Questions

How does winter clothing affect self-defense ammunition like JHP rounds?

Winter clothing can clog the hollow point cavity of JHP ammunition, preventing expansion. This can turn a JHP into an FMJ-like projectile, leading to excessive penetration and reduced effectiveness in a self-defense scenario, as demonstrated with .380 ACP and 9mm Luger rounds.

Which calibers are most affected by winter clothing barriers?

Smaller caliber JHP rounds, such as .380 ACP and 9mm Luger, are most susceptible to failure to expand when fired through heavy winter clothing. The .45 ACP also showed failure to expand in testing.

Does FMJ ammunition perform better than JHP through winter clothing?

In this test, 9mm FMJ ammunition showed extreme penetration, similar to the non-expanded JHP rounds. The primary advantage of JHP is expansion, which is often negated by clothing, making its performance comparable to FMJ in such conditions.

What caliber reliably expanded through winter clothing in the test?

The 10mm Auto JHP was the only caliber tested that reliably expanded after passing through multiple layers of winter clothing, including a heavy canvas coat. This suggests higher velocity rounds may be less affected by clothing barriers.

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