LMT MWS 20" - Top Tier MRGG, or "Learning Machining Together"?

Published on May 22, 2026
Duration: 16:48

This video details the testing of an LMT MWS 20-inch rifle in 6.5 Creedmoor, highlighting initial accuracy issues attributed to loose barrel screws. After retorquing, performance improved, but subsequent testing with a second barrel revealed significant ammunition sensitivity, with the rifle performing best with specific 120-grain loads. The review emphasizes the importance of sample size in accuracy testing and discusses the frustration of ammo-picky rifles.

Quick Summary

The LMT MWS 20-inch rifle in 6.5 Creedmoor initially suffered from poor accuracy due to loose barrel screws. After retorquing, performance improved, but the rifle proved highly sensitive to ammunition, favoring specific 120-grain loads over heavier options. Accurate assessment requires considering sample size and testing multiple ammunition types.

Chapters

  1. 00:00Introduction & Initial Issues
  2. 00:34The Saga of the LMT MWS 20 Inch
  3. 01:03First Range Trip & Barrel Screw Problem
  4. 01:40Long Range Success & Subsequent Problems
  5. 02:10Consulting with Miles Neville
  6. 02:41Securing a Second Barrel
  7. 02:51Testing Barrel #2: Ammunition Sensitivity
  8. 03:49AAC 140gr Group
  9. 03:75Federal Gold Medal Match 140gr Group
  10. 04:42Nosler 140gr RDF Group
  11. 05:00Hornady 120gr ELD-M: The Secret Weapon
  12. 05:57More AAC 140gr Testing
  13. 06:49Analyzing Group Sizes & Sample Size
  14. 07:54Comparing Barrels & Ammunition Pickiness
  15. 09:36Conclusion: Practical Accuracy

Frequently Asked Questions

What were the initial accuracy problems with the LMT MWS 20-inch rifle?

The LMT MWS 20-inch rifle initially produced group sizes over three inches. This was traced back to the barrel screws being barely hand-tight, indicating a potential issue during shipping or assembly.

How did retorquing the barrel screws affect the LMT MWS's performance?

After retorquing the barrel screws to the correct specification, the LMT MWS 20-inch rifle's accuracy significantly improved, allowing it to perform well at distance.

Is the LMT MWS 20-inch rifle sensitive to different types of ammunition?

Yes, the LMT MWS 20-inch rifle demonstrated significant ammunition sensitivity. It performed best with specific 120-grain loads, while struggling to stabilize heavier 140-grain rounds.

What is the importance of sample size in rifle accuracy testing?

The video emphasizes that a single good group may not accurately represent a rifle's true performance. Shooting multiple groups with various ammunition types and larger sample sizes (e.g., nine shots) provides a more reliable assessment.

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