The Sad Failure of the Leitner-Wise .499 LWR Rifle

Published on July 10, 2021
Duration: 20:44

This video provides an in-depth review of the Leitner-Wise .499 LWR rifle, a concept developed to meet a specific US Coast Guard requirement for boarding parties. The presenter, with apparent historical knowledge of the program, details the rifle's design, the ambitious and sometimes contradictory requirements, and the various ammunition types developed for it. The core of the video focuses on the significant technical and reliability issues that plagued the .499 LWR, leading to its ultimate failure and the program's cancellation. It highlights the importance of proper engineering, controlled development processes, and listening to manufacturing partners, using this rifle as a case study of a good concept gone wrong.

Quick Summary

The Leitner-Wise .499 LWR rifle, developed for the US Coast Guard, failed due to critical design flaws in its cartridge, including excessive pressure, improper crimping, and lack of taper, compounded by unreliable magazines. Manufacturer LMT lacked control over cartridge design, preventing necessary fixes, ultimately leading to the program's cancellation.

Chapters

  1. 00:08Introduction to the Leitner-Wise .499 LWR
  2. 00:31US Coast Guard Requirements
  3. 01:18Paul Leitner-Wise and the Project
  4. 01:29Comparison to Other Large Caliber AR Cartridges
  5. 02:03.499 LWR Ammunition Types
  6. 02:21Cartridge Case Specifications
  7. 03:02Frangible and Armor Piercing Rounds
  8. 03:27Corrosion Issues with Copper-Tin Alloy
  9. 03:57Solid Copper and Steel Core Rounds
  10. 04:28Polymer Copper Blend Ammunition
  11. 04:54Leitner-Wise Rifle Company as a Think Tank
  12. 05:02Collaboration with Lewis Machine & Tool (LMT)
  13. 05:39The Final Rifle Design
  14. 05:50Lower Receiver and Stock
  15. 06:06Upper Receiver Modifications
  16. 06:11Barrel and Muzzle Brake
  17. 06:26Gas System and Handguard
  18. 06:37Barrel Specifications
  19. 06:47Ejection Port Modification
  20. 07:19Bolt Carrier and Enhanced Bolt
  21. 07:51Magazine Issues
  22. 08:16Rifle Models (Standard, DMR, CQB)
  23. 08:53Early Demonstrations and Failures
  24. 09:55Repeated Malfunctions and Development Cycles
  25. 10:09Interview with Carl Lewis (LMT)
  26. 11:17Reasons for Failure: System and Cartridge Changes
  27. 11:47Lack of Design Authority Over Cartridge
  28. 12:10Coast Guard Order and Prototype Requirement
  29. 12:29Summary of Key Issues
  30. 12:30Cartridge Pressure and Extraction Problems
  31. 12:36Lack of Taper and Improper Crimping
  32. 13:00Demonstration with Colt
  33. 13:15Art Daigle's Modifications
  34. 13:30Range Test and Performance
  35. 15:22Range Test Results (2021)
  36. 15:39Magazine Malfunction Breakdown
  37. 16:01Ammunition Rarity and Reloading
  38. 16:24Potential vs. Execution
  39. 16:39Coast Guard Upper Receiver Concept
  40. 16:50Ammunition Failures Recap
  41. 17:06The Only Working Round: Copper with AP Core
  42. 17:14Anti-Materiel Rifle Potential
  43. 17:26Other Potential Uses (Line Thrower)
  44. 17:37Overall Program Failure
  45. 17:41Rifle Specifications Recap
  46. 18:17Common Sights (Metrolite)
  47. 18:31Historical Context and Program Drop
  48. 18:43Lack of Competition for Requirement
  49. 18:50Distinction from Modern LWRC
  50. 19:15A Piece of History
  51. 19:20Lessons Learned: Good Ideas Gone Wrong
  52. 19:38Belief in Fixing the .499 LWR
  53. 19:51Colt's Success with Modifications
  54. 20:00Potential vs. Leadership
  55. 20:09Early Big Bore Cartridge Landscape
  56. 20:14Comparison to .50 Beowulf and .458 SOCOM
  57. 20:27.450 Bushmaster Success
  58. 20:39Conclusion and Call to Action

Frequently Asked Questions

What was the primary purpose of the Leitner-Wise .499 LWR rifle?

The Leitner-Wise .499 LWR rifle was designed to meet a specific US Coast Guard requirement for boarding parties. Its intended uses included potentially sinking small ships, destroying outboard engines, and firing into ship hulls without causing the vessel to sink.

What were the main technical issues that caused the .499 LWR rifle to fail?

The .499 LWR suffered from critical issues including the cartridge being too hot, leading to excessive pressure for extraction. It also lacked case taper and was improperly crimped, causing rounds to only partially chamber. Magazine reliability was also a significant problem, with frequent feeding and chambering failures.

Did Lewis Machine & Tool (LMT) have control over the .499 LWR cartridge design?

No, LMT, the manufacturer, did not have design authority or control over the .499 LWR cartridge. They performed manufacturing as directed, but were unable to implement necessary changes to the ammunition, which was a key factor in the rifle's failure.

How did Colt manage to make the .499 LWR rifle work during demonstrations?

During demonstrations at Colt, Art Daigle, a senior R&D engineer, made the .499 LWR functional by polishing the chamber and, crucially, re-crimping the cartridges to ensure proper feeding and chambering. However, Colt lost interest once the original requirement was dropped.

What is the difference between the original Leitner-Wise Rifle Company and modern LWRC International?

The original Leitner-Wise Rifle Company, which developed the .499 LWR, is distinct from the modern LWRC International (Land Warfare Research Incorporated). The latter is a completely different company with different management and quality standards, though it has some historical roots from the original entity.

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