Bizarro Single-Action Calibers — GMP # 161

Published on December 9, 2022
Duration: 30:03

This discussion explores the surprising versatility of single-action revolvers, highlighting their ability to chamber and fire cartridges that headspace on the case mouth, unlike most double-action revolvers. The conversation delves into specific examples like 9mm and .45 ACP in single-action platforms, emphasizing the engineering considerations for such conversions and the potential for creative ammunition use, particularly for reloaders.

Quick Summary

Single-action revolvers possess a unique design that allows them to headspace cartridges on the case mouth, unlike most double-action models that require a rim. This capability enables conversions to calibers such as 9mm and .45 ACP, though precise cylinder machining is crucial for safety and accuracy. While technically feasible, widespread production of these conversions is limited by economic factors and manufacturing complexities.

Chapters

  1. 00:00Introduction to Guns Magazine Podcast
  2. 00:32Sponsor: Kimber R7 Mako
  3. 01:41Topic: Bizarro Single-Action Calibers
  4. 02:14Interview with Roy Huntington
  5. 03:07The 9mm Single-Action Revolver
  6. 04:00Ruger Blackhawks & Convertible Cylinders
  7. 05:01Headspacing in Single-Action Revolvers
  8. 05:45.45 ACP Single-Action Conversions
  9. 06:53Rare Calibers: .25 ACP & .30 Carbine
  10. 07:49Rimfire and Semi-Rimmed Cartridges
  11. 09:04Reloading Possibilities for 9mm SA
  12. 10:32One-Off Projects of Gun Makers
  13. 13:35Funny Moments at Gun Factories
  14. 15:30Ruger Booth Anecdote
  15. 17:35Manufacturing Capacity & Market Economics
  16. 19:33Challenges with Exotic Materials (Damascus, Titanium)
  17. 21:32Automag Revival & High-Cost Projects
  18. 22:31Ideal Single-Action Caliber Ideas
  19. 23:33Ruger Hawkeye & .22 Jet
  20. 25:11Single-Six in .32 H&R Magnum & .30 Super Carry
  21. 26:24Contender Story: .25 ACP
  22. 27:31The Mindset of Firearm Enthusiasts
  23. 28:02Podcast Success Factors
  24. 28:39Outro & Sponsor Reminder

Frequently Asked Questions

Can single-action revolvers fire cartridges that don't have a rim?

Yes, single-action revolvers can often chamber and fire cartridges that headspace on the case mouth, unlike most double-action revolvers which require a rim. This design flexibility allows for conversions to cartridges like 9mm and .45 ACP, though proper machining of the cylinder is critical for safety and accuracy.

What are some unusual calibers found in single-action revolvers?

Beyond standard calibers, single-action revolvers have been chambered in less common rounds like 9mm, .45 ACP, .30 Carbine, .25 ACP, and even experimental cartridges like the 9mm Wildey Magnum. These often result from custom work or limited production runs exploring unique ballistic possibilities.

Why don't more companies make single-action revolvers in calibers like 9mm or .45 ACP?

While technically feasible, producing single-action revolvers in common semi-automatic pistol calibers involves significant R&D, retooling, marketing, and distribution efforts. Manufacturers often find these costs outweigh the projected sales volume, making them economically unviable compared to established product lines.

What makes converting a single-action revolver to a non-rimmed cartridge challenging?

The primary challenge is ensuring correct headspacing. Unlike rimmed cartridges, non-rimmed ones like 9mm or .45 ACP rely on the case mouth seating against a shoulder in the chamber or forcing cone. Precise machining of the cylinder and chamber is essential for safe and accurate function.

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