REAL 10MM! Underwood 135 Grain vs 165 Grain! Ballistic Gel Test Using the Glock 20!

Published on February 25, 2022
Duration: 12:24

This comprehensive ballistic gel test by Tools&Targets evaluates two Underwood 10mm Auto loads: a 135gr JHP and a 165gr Bonded JHP, fired from a Glock 20 Gen 4. The test reveals significant differences in terminal performance, with the 165gr bonded round demonstrating superior integrity and expansion, making it the preferred choice for 'real' 10mm effectiveness.

Quick Summary

In a ballistic gel test using a Glock 20 Gen 4, Underwood 10mm 135gr JHP fragmented severely, losing mass, while the 165gr Bonded JHP retained all its mass and expanded to approximately 1 inch. Both rounds penetrated 10.25 inches, but the 165gr offered superior terminal ballistics.

Chapters

  1. 00:00Introduction & 10mm Ammo Importance
  2. 00:51Ballistic Gel Setup
  3. 01:12Ammunition Details - Underwood 135gr vs 165gr
  4. 01:57Firearm Used - Glock 20 Gen 4
  5. 02:06Chronograph Test - 135gr Underwood
  6. 03:14Chronograph Test - 165gr Underwood
  7. 03:44Velocity Comparison & Test Setup
  8. 04:07Ballistic Gel Test - 135gr Underwood
  9. 05:09Ballistic Gel Test - 165gr Underwood
  10. 05:36Ballistic Gel Results - Wounds
  11. 06:42Penetration Measurements
  12. 07:16Projectile Weight Retention
  13. 08:21Projectile Expansion Measurements
  14. 08:59Summary of Ammunition Performance
  15. 09:41Concluding Thoughts & 10mm vs. 40 S&W
  16. 11:16Call to Action & Farewell

Frequently Asked Questions

What are the key differences between Underwood 10mm 135gr JHP and 165gr Bonded JHP in ballistic gel tests?

The 135gr JHP fragmented significantly, losing mass, while the 165gr Bonded JHP retained all its mass and expanded to approximately 1 inch. Both achieved 10.25 inches of penetration in gel.

What were the observed velocities for Underwood 10mm 135gr and 165gr loads fired from a Glock 20 Gen 4?

The Underwood 10mm 135gr JHP averaged 1489 fps, and the 165gr Bonded JHP averaged 1301 fps. These were lower than the advertised velocities.

Which Underwood 10mm load performed better in terminal ballistics testing?

The 165gr Bonded JHP demonstrated superior terminal ballistics by retaining its mass and expanding reliably to about 1 inch, making it the preferred choice for effective energy transfer.

What is the recommended 10mm ammunition for self-defense based on this test?

Based on this ballistic gel test, the Underwood 10mm 165gr Bonded JHP is recommended for its reliable expansion, mass retention, and consistent wound channel, showcasing 'real' 10mm performance.

More Reviews Videos You Might Like

More from Tools&Targets

View all →