9mm Velocity Test Various Barrel Lengths 3.3" 4.5" 7.5" 10.5" Taurus Glock BCA PSA 9x19

Published on January 1, 2026
Duration: 19:26

This video provides a comprehensive 9mm velocity test across four different barrel lengths (3.38", 4.5", 7.5", 10.5") using various firearms including the Taurus GX4, Glock 17, BCA BC9, and PSA AK-V. The expert analysis highlights how barrel length significantly impacts projectile velocity and energy with different ammunition types, from standard FMJ to +P defensive rounds and lightweight, high-velocity options. The data collected using a chronograph offers valuable insights for understanding terminal ballistics and optimal firearm/ammunition pairings.

Quick Summary

A 9mm velocity test across barrel lengths from 3.38" to 10.5" reveals significant velocity gains with increased barrel length. For example, 147gr subsonic rounds increased from ~930 fps to ~1184 fps, and lightweight 50gr +P rounds exceeded 2500 fps from the longest barrel, demonstrating the impact of barrel length on projectile energy.

Chapters

  1. 00:00Introduction and Gear Overview
  2. 02:55Blazer Brass 147gr FMJ Test
  3. 06:43AAC 115gr FMJ Test
  4. 08:01Winchester 124gr NATO and 115gr Service Grade
  5. 10:40Defensive Ammo Testing (+P)
  6. 14:04High-Velocity Lightweight Rounds
  7. 17:20Conclusion and Summary

Frequently Asked Questions

How does barrel length affect 9mm bullet velocity?

Barrel length significantly impacts 9mm bullet velocity. For instance, 147gr subsonic rounds increased from ~930 fps in a 3.38" barrel to ~1184 fps in a 10.5" barrel. Lighter rounds like 50gr +P can exceed 2500 fps from longer barrels, showing substantial gains.

What is the optimal barrel length for 9mm ammunition?

The optimal barrel length for 9mm varies by ammunition type. For standard pressure 147gr rounds, 10-12 inches appears near optimal before friction slows the projectile. For lighter, high-velocity rounds, longer barrels continue to add significant velocity.

Which 9mm ammunition performed best in the velocity test?

Performance varied by barrel length. Lightweight rounds like the 50gr Liberty +P achieved extreme velocities over 2500 fps from a 10.5" barrel. Standard 115gr FMJ reached nearly 1400 fps from the longest barrel, while 147gr subsonic rounds topped out around 1184 fps.

What tools are needed for a 9mm velocity test?

A key tool for a 9mm velocity test is a ballistic chronograph, such as the Caldwell Ballistic Precision Chronograph, to accurately measure projectile speed. Firearms with varying barrel lengths (e.g., Taurus GX4, Glock 17, BCA BC9, PSA AK-V) and a selection of 9mm ammunition are also essential.

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