Will 40SW work in a 10mm?

Published on February 6, 2019
Duration: 23:41

This video provides practical, real-world testing of firing 40 Smith & Wesson ammunition in 10mm firearms, including both semi-automatic pistols and revolvers. The presenter, drawing on personal experience and addressing online misinformation, demonstrates the function, reliability, and accuracy differences, particularly highlighting issues with 40 S&W shot shells in revolvers due to case splitting, not ignition failure. The content offers valuable data for firearm owners considering ammunition compatibility.

Quick Summary

40 Smith & Wesson ammunition can often be fired in 10mm firearms, especially with the use of full moon clips in revolvers. While standard 40 S&W ball rounds generally ignite reliably, 40 S&W shot shells, particularly aluminum-cased ones, can split and cause malfunctions in 10mm revolvers. Testing is crucial for any ammunition substitution.

Chapters

  1. 00:00Introduction: 40 S&W in 10mm Firearms
  2. 00:09Historical Context of 10mm and 40 S&W Availability
  3. 01:19Comparing 40 S&W and 10mm Cartridge Length
  4. 01:50Testing 40 S&W in a 10mm Ruger 1911 Auto
  5. 03:43Testing 40 S&W in a 10mm Ruger GP100 Revolver
  6. 05:02First Shots: 40 S&W in 10mm Revolver with Moon Clips
  7. 05:19Testing 40 S&W Shot Shells in 10mm Revolver
  8. 07:24Malfunction: Case Splitting with 40 S&W Shot Shells
  9. 08:38Continued Testing of 40 S&W Shot Shells
  10. 10:04Summary of Revolver Shot Shell Testing
  11. 10:46Testing 40 S&W Shot Shells in a 10mm Automatic Pistol
  12. 11:04Malfunction: Stovepipe with 40 S&W Shot Shells in Auto
  13. 14:15Extended Testing: 100 Rounds of 40 S&W in Revolver
  14. 14:28Testing Different 40 S&W Ball Ammunition
  15. 16:27Accuracy Comparison: 40 S&W vs. 10mm in Revolver
  16. 17:46Accuracy Results Analysis
  17. 18:01Case Integrity of Brass 40 S&W in 10mm Revolver
  18. 19:03Can 9mm Shot Shells Cycle a 40 S&W Auto?
  19. 20:08More 40 S&W Firing in 10mm Revolver
  20. 20:48Potential Damage of 40 S&W in 10mm Revolver
  21. 21:42Recoil Comparison: 40 S&W vs. 10mm
  22. 22:09Final Summary: 40 S&W in 10mm Firearms
  23. 22:32Conclusion and Support the Channel

Frequently Asked Questions

Can I safely fire 40 Smith & Wesson ammunition in my 10mm handgun?

While 40 S&W can often fire in 10mm firearms, it's not always recommended without testing. In semi-automatic pistols, the extractor usually holds the shorter 40 S&W case for firing. In revolvers, full moon clips are often necessary to position the rim correctly. However, specific firearm models and ammunition types can yield different results, and testing is crucial.

What are the risks of shooting 40 S&W in a 10mm revolver?

The primary risk observed with 40 S&W shot shells in 10mm revolvers is case splitting, particularly with aluminum cases, which can cause malfunctions. Standard 40 S&W ball ammunition generally ignites reliably when used with full moon clips, but it's essential to test your specific firearm and ammunition combination.

Does shooting 40 S&W in a 10mm firearm affect accuracy?

Based on testing, shooting 40 S&W ammunition in a 10mm revolver did not appear to negatively affect accuracy. In some instances, the 40 S&W even produced slightly better groups than the 10mm ammunition, suggesting minimal impact on precision for this specific application.

Will 40 S&W shot shells cycle the action of a 10mm automatic pistol?

Generally, 40 S&W shot shells will not cycle the action of a 10mm automatic pistol. Unlike standard ball ammunition, they typically lack the power to operate the slide, requiring manual cycling of the firearm. This is a common characteristic of shot shells in semi-automatic handguns.

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