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 guide details a professional ballistic gel test of Underwood Xtreme Defender 9mm ammunition, including +P and +P+ variants. The test, conducted by a Tools&Targets host with high authority, utilizes a LabRadar chronograph and an HK SP5 to measure extreme velocities and terminal performance through a clothing barrier. Key takeaways include detailed penetration depths and projectile integrity analysis, highlighting the effectiveness of these specialized rounds for self-defense scenarios.

Quick Summary

In a ballistic gel test, Underwood Xtreme Defender 9mm 68gr +P averaged 2201 fps and 731 ft-lb energy, penetrating 20.25 inches. The 90gr +P+ averaged 1787 fps with 638 ft-lb energy, penetrating 21 inches. Both solid copper projectiles showed no expansion, retaining nearly all their weight, with the 68gr round favored for higher velocity and energy from a longer barrel.

Chapters

  1. 00:00Introduction and Setup
  2. 00:46Ammunition Overview
  3. 01:51Test Firearm
  4. 02:04Velocity Testing: 68gr +P
  5. 03:47Velocity Testing: 90gr +P+
  6. 05:17Ballistic Gel Testing
  7. 06:19Gel Results Analysis
  8. 09:00Projectile Recovery and Measurements
  9. 11:26Conclusion

Frequently Asked Questions

What are the key performance differences between Underwood Xtreme Defender 68gr +P and 90gr +P+ 9mm ammunition?

The 68gr +P averaged 2201 fps with 731 ft-lb energy and 20.25" penetration, while the 90gr +P+ averaged 1787 fps with 638 ft-lb energy and 21" penetration from an 8.9" barrel. The 68gr round is favored for higher velocity and energy in this test setup.

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

Recovered projectiles were solid copper and showed no expansion or deformation. They retained nearly 100% of their original weight, indicating durability and consistent performance without traditional expansion.

What firearm and equipment were used in the Underwood Xtreme Defender ballistic gel test?

The test utilized an HK SP5 with an 8.9-inch barrel and a LabRadar chronograph. Ballistic gel blocks were used with a heavy clothing barrier to simulate real-world conditions.

What is the significance of the fluted design on Underwood Xtreme Defender ammunition?

The fluted design, combined with high velocities, likely causes significant disruption within the ballistic gel, creating a large temporary cavity through tumbling and hydraulic effects, enhancing terminal performance.

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