11.5" vs 12.5" Barrels - Velocity Comparison

Published on March 11, 2020
Duration: 3:44

This video compares the velocity differences between 11.5-inch and 12.5-inch Proof Research barrels using 55-grain ammunition and a Lab Radar chronograph. The 12.5-inch barrel demonstrated a significant velocity gain, suggesting improved stability at extended ranges. The test highlights how even a one-inch difference in barrel length can impact ballistic performance.

Quick Summary

Comparing 11.5-inch and 12.5-inch Proof Research barrels with 55-grain ammunition revealed a significant velocity difference. The 11.5" barrel averaged 2455 FPS, while the 12.5" barrel averaged 2683 FPS, a gain of 228 FPS. This increase contributes to better stability and performance at extended ranges.

Chapters

  1. 00:00Introduction and Setup
  2. 00:16Rifle Specifications
  3. 00:33Testing Objective: Barrel Length Impact
  4. 00:45Lab Radar Chronograph Setup
  5. 01:26Testing the 11.5-inch Barrel
  6. 01:5611.5-inch Barrel Velocity Results
  7. 02:18Testing the 12.5-inch Barrel
  8. 03:0512.5-inch Barrel Velocity Results
  9. 03:07Comparison and Conclusion
  10. 03:30Call to Action

Frequently Asked Questions

What is the velocity difference between 11.5-inch and 12.5-inch AR barrels?

In this test using 55-grain ammunition, the 11.5-inch Proof Research barrel averaged 2455 FPS, while the 12.5-inch barrel averaged 2683 FPS. This represents a gain of approximately 228 FPS with the longer barrel.

How does barrel length affect rifle performance at extended ranges?

A longer barrel generally increases projectile velocity, which can lead to a flatter trajectory and more retained energy at extended ranges. This improved stability makes hitting targets at distances like 500-600 yards more attainable.

What equipment was used for the barrel length velocity test?

The test utilized two identical rifles except for barrel length (11.5" vs 12.5" Proof Research barrels), 55-grain ammunition, and a Lab Radar chronograph to accurately measure muzzle velocities.

Is a one-inch difference in barrel length significant for AR-15s?

Yes, a one-inch difference can be significant, as demonstrated by the ~228 FPS velocity gain observed between the 11.5" and 12.5" barrels. This velocity difference impacts ballistic performance and range capability.

Related News

All News →

More Training & Techniques Videos You Might Like

More from Big Daddy Unlimited

View all →