Different Barrels, Same Length, Velocity Testing With BCA Upper Update!!!

Published on June 11, 2024
Duration: 9:35

This video details a process for comparing the velocity differences between two 18-inch 6.5 Grendel barrels from different manufacturers (Bear Creek Arsenal and Diamondback Firearms). The presenter outlines a methodical barrel swap procedure, emphasizing the importance of consistent components and proper torque. The testing involves chronographing two different bullet weights (123gr SST and 90gr Varmageddon) to illustrate how barrel variations can affect muzzle velocity.

Quick Summary

Testing 18-inch 6.5 Grendel barrels from Bear Creek Arsenal and Diamondback Firearms revealed that barrel manufacturing differences can cause muzzle velocity variations of 15-20 feet per second. This highlights the importance of individual barrel testing for accurate load data, especially when dealing with potential assembly issues like over-torqued barrel nuts.

Chapters

  1. 00:10Introduction & Project Goal
  2. 00:31Initial BCA Barrel Issues
  3. 00:57Introducing the Diamondback Barrel
  4. 01:21Observed Velocity Discrepancies
  5. 01:31Testing Methodology: Same Upper, Different Barrels
  6. 01:55Ammunition Selection for Testing
  7. 02:22The Barrel Nut Problem Revealed
  8. 03:21BCA Upper Sent Back for Repair
  9. 03:58Updated BCA Upper Configuration
  10. 04:14Three Barrels for Data Collection
  11. 05:03Testing with 123gr SST Loads
  12. 05:43Testing with 90gr Varmageddon Loads
  13. 06:00Testing the Second BCA Barrel
  14. 06:56Testing the Diamondback Barrel
  15. 07:49Velocity Data Comparison: BCA vs Diamondback
  16. 08:15Consistency Between Identical Barrels
  17. 08:19Velocity Differences Between Brands
  18. 08:3090gr Load Velocity Comparison
  19. 08:43Conclusion: Barrels Matter
  20. 09:07Final Thoughts & Outro

Frequently Asked Questions

What is the purpose of testing different 18-inch 6.5 Grendel barrels?

The video aims to demonstrate how barrel variations between manufacturers, even at the same length, can impact muzzle velocity. This is crucial for understanding ammunition performance and potential deviations from published load data.

What issues were encountered during the barrel swap process?

The presenter experienced significant difficulty removing a Bear Creek Arsenal barrel nut due to extreme over-torquing, requiring extensive effort and heat. This highlighted a potential quality control issue with the initial assembly.

How much velocity difference was observed between the tested barrels?

Approximately 15-20 feet per second difference in muzzle velocity was observed between the two 18-inch 6.5 Grendel barrels tested, even when using identical components and ammunition.

What types of ammunition were used for the velocity testing?

The testing utilized Federal Fusion MSR 123gr SST and Hornady Varmageddon 90gr ammunition. These different bullet weights were chosen to see how barrel variations affect performance across a range of projectile sizes.

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