Liberty UltraDefense USM4 Test and Review

Published on January 5, 2016
Duration: 2:18

This review tests the Liberty UltraDefense USM4 9mm ammunition. The 50-grain lead-free projectile boasts a claimed 2000 fps velocity and 450 ft-lbs of muzzle energy. While demonstrating impressive wound cavity potential in ballistic gelatin and performing well in a 4-inch barrel pistol, it failed to reliably cycle a short-barreled Walther PPS due to insufficient energy.

Quick Summary

The Liberty UltraDefense USM4 9mm ammunition features a 50-grain lead-free projectile with a claimed 2000 fps velocity and 450 ft-lbs of muzzle energy. It demonstrated impressive wound cavity potential in ballistic gelatin but failed to reliably cycle a short-barreled Walther PPS due to insufficient energy.

Chapters

  1. 00:00Introduction: Liberty UltraDefense USM4 9mm
  2. 00:04Projectile Specs: Lead-Free, 50 Grains, 2000 FPS
  3. 00:11Muzzle Energy and Claims
  4. 00:15Wound Cavity and Penetration
  5. 00:22Test 1: Walther PPS (3.2" Barrel)
  6. 00:54PPS Cycling Failure Analysis
  7. 01:07Test 2: Walther P99 (4" Barrel)
  8. 01:32P99 Accuracy and Recoil
  9. 01:38Test 3: Ballistics Gel (Glock 19)
  10. 01:51Gelatin Wound Cavity Analysis
  11. 02:10Recovered Projectile Fragments
  12. 02:13Conclusion: Performance Summary

Frequently Asked Questions

What are the specifications of the Liberty UltraDefense USM4 9mm ammunition?

The Liberty UltraDefense USM4 9mm features a 50-grain lead-free projectile with an advertised velocity of 2000 feet per second, generating approximately 450 foot-pounds of muzzle energy. It's designed for a fragmenting core to create a significant wound cavity.

How did the Liberty UltraDefense USM4 9mm perform in a Walther PPS pistol?

The ammunition failed to reliably cycle the 3.2-inch barreled Walther PPS. This is attributed to the lightweight projectile potentially not generating enough energy to operate the firearm's action effectively.

What was the ballistic gelatin performance of the Liberty UltraDefense USM4 9mm?

In ballistic gelatin, the projectile created a massive wound cavity, with most energy deposited in the initial inches. A smaller core fragment penetrated to approximately 12 inches, indicating effective terminal performance.

Is Liberty UltraDefense USM4 9mm suitable for all 9mm firearms?

While it performed well in a 4-inch barreled Walther P99, its lightweight nature may cause cycling issues in shorter-barreled firearms or those less tolerant of lighter ammunition, like the Walther PPS tested.

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