357 Magnum | How Much Does Barrel Length Matter?

Published on March 12, 2024
Duration: 9:20

This video investigates the impact of barrel length on 357 Magnum velocity using a 3-inch and a 4 5/8-inch revolver. Chronograph data was collected for various bullet weights (110gr to 180gr) from different manufacturers and handloads. The analysis suggests that the difference in velocity between these two barrel lengths is not as significant as one might expect, with variations often being within a few hundred feet per second.

Quick Summary

Testing 357 Magnum revolvers with 3-inch and 4 5/8-inch barrels showed that barrel length has a modest impact on velocity. For instance, 180gr loads averaged around 1331 fps from the 3-inch and 1377 fps from the 4 5/8-inch, a difference of about 46 fps. Lighter loads also showed similar modest gains with the longer barrel.

Chapters

  1. 00:10Introduction: 357 Magnum Velocity Testing
  2. 00:29Revolvers Used: 3-inch vs. 4 5/8-inch
  3. 00:42Ammunition Selection: Bullet Weights & Types
  4. 01:28Chronograph Data: 3-inch Barrel Testing
  5. 03:55Chronograph Data: 4 5/8-inch Barrel Testing
  6. 06:35Data Analysis & Velocity Comparison
  7. 07:33Summary of Results: Barrel Length Impact
  8. 08:30Grip Recommendation: Pachmayr Grips
  9. 09:12Conclusion & Viewer Thoughts

Frequently Asked Questions

How much does barrel length affect 357 Magnum velocity?

Testing a 3-inch and a 4 5/8-inch barrel 357 Magnum revealed that the velocity difference is not drastic. For example, 180gr loads averaged around 1331 fps from the 3-inch and 1377 fps from the 4 5/8-inch, a difference of about 46 fps. Lighter loads showed similar modest gains with the longer barrel.

What are the best bullet weights to test for 357 Magnum barrel length impact?

To assess barrel length impact on 357 Magnum velocity, it's effective to test a range of bullet weights. This video used 180gr, 170gr, 158gr, and 110gr loads, including heavy hard cast and standard factory options, to provide a comprehensive comparison across different ballistic profiles.

Does a longer barrel always mean significantly higher velocity for 357 Magnum?

While a longer barrel generally yields higher velocity, the increase for 357 Magnum between a 3-inch and a 4 5/8-inch barrel in this test was modest, often under 100 fps. The specific ammunition and its burn rate play a significant role in how much velocity is gained from additional barrel length.

Are Pachmayr grips recommended for heavy 357 Magnum loads?

Based on the speaker's experience, Pachmayr grips on a Smith & Wesson 686 may increase felt recoil with heavy 357 Magnum loads. It's suggested to consider alternative grips if shooting hot loads to manage recoil more effectively.

Related News

All News →

More Range & Competition Videos You Might Like

More from The Gun Dungeon

View all →