Various Barrel Lengths Speer Gold Dot 9mm 124gr +P Ballistic Gel Test & Review

Published on January 3, 2026
Duration: 11:39

This ballistic gel test by Buckeye Ballistics examines the performance of Speer Gold Dot 9mm 124gr +P ammunition across various barrel lengths (3.3" to 10.5"). The results demonstrate how increased velocity from longer barrels affects bullet expansion and penetration, with surprising outcomes at extreme velocities.

Quick Summary

Longer barrels increase muzzle velocity, generally enhancing hollow-point expansion. However, Speer Gold Dot 9mm 124gr +P tests revealed that extreme velocities from very long barrels (10.5") can cause over-expansion and fragmentation, reducing penetration compared to shorter barrels.

Chapters

  1. 00:00Introduction: Speer Gold Dot 9mm +P Gel Test
  2. 00:34Velocity & Energy Data by Barrel Length
  3. 01:07Ballistic Gel Setup & Calibration
  4. 01:48Handgun Testing: Taurus GX2 vs Glock 17
  5. 02:11Handgun Results: Expansion vs Penetration
  6. 04:37PCC Testing: 7.5" vs 10.5" Barrels
  7. 05:27PCC Results: Unexpected Penetration
  8. 08:11Final Comparison & Effective Range

Frequently Asked Questions

How does barrel length affect Speer Gold Dot 9mm 124gr +P performance?

Longer barrels increase velocity, which generally promotes better hollow-point expansion. However, excessively high velocities from very long barrels can cause the bullet to over-expand and fragment, potentially reducing penetration.

What were the key findings of the Speer Gold Dot 9mm 124gr +P ballistic gel test?

The test showed that while longer barrels increased velocity, the 10.5" barrel resulted in less penetration than the 7.5" barrel due to bullet fragmentation. The 4.5" barrel showed more expansion but less penetration than the 3.3" barrel.

What is the significance of barrel length for hollow-point ammunition?

Barrel length directly impacts muzzle velocity. For hollow-point ammunition, achieving a sufficient velocity is crucial for reliable expansion. Longer barrels can extend the effective range at which a bullet will expand.

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