WARP SPEED!...9MM 68+P VS 90+P+ Underwood Xtreme Defender Self-Defense AMMO Ballistic Gel Test!

Published on January 25, 2026
Duration: 13:12

This video provides an expert-level ballistic gel test of Underwood Xtreme Defender 9mm ammunition, specifically the 68-grain +P and 90-grain +P+ variants. The host, demonstrating high authority through detailed analysis and professional equipment, evaluates their terminal performance fired from an HK SP5 with an 8.9-inch barrel. The test highlights extreme velocities and deep penetration, offering valuable data for self-defense ammunition selection.

Quick Summary

In a ballistic gel test, Underwood Xtreme Defender 9mm 68gr +P achieved 2201 FPS and 731 ft-lbs from an 8.9-inch barrel, penetrating 20.25 inches. The 90gr +P+ averaged 1787 FPS and 638 ft-lbs, penetrating 21 inches. Both solid copper fluted projectiles retained 100% weight without expansion.

Chapters

  1. 00:00Introduction and Test Setup
  2. 00:46Underwood Xtreme Defender Ammo Overview
  3. 01:51Test Firearm: HK SP5
  4. 02:04Velocity Test: 68gr +P
  5. 03:47Velocity Test: 90gr +P+
  6. 05:17Ballistic Gel Impact and Cavity
  7. 06:19Gel Results: Penetration and Disruption
  8. 09:00Projectile Recovery and Weight Analysis
  9. 11:26Conclusion and Expert Recommendation

Frequently Asked Questions

What were the key performance differences between the Underwood Xtreme Defender 68gr +P and 90gr +P+ 9mm rounds in the gel test?

The 68gr +P achieved a higher average velocity of 2201 FPS and energy of 731 ft-lbs from an 8.9-inch barrel, while the 90gr +P+ averaged 1787 FPS with 638 ft-lbs. Both demonstrated deep penetration exceeding 20 inches in ballistic gel.

How did the Underwood Xtreme Defender projectiles perform after impacting the ballistic gel?

Recovered projectiles from both the 68gr +P and 90gr +P+ loads showed no expansion or deformation. They retained nearly 100% of their original weight, indicating the solid copper fluted design prioritizes penetration and integrity over traditional expansion.

What firearm was used for the Underwood Xtreme Defender 9mm ballistic gel test, and why?

An HK SP5 with an 8.9-inch barrel was used to maximize the velocity potential of the lightweight, high-pressure Underwood rounds. This longer barrel allows the projectiles to achieve significantly higher speeds than typically seen from standard handgun barrels.

What is the terminal ballistics profile of Underwood's Xtreme Defender ammunition?

Underwood Xtreme Defender ammunition utilizes solid copper fluted projectiles designed for high velocity and deep penetration. Instead of expanding, they rely on the flutes and projectile shape to create significant wound channels and hydraulic effects within tissue.

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