Fixing Failures with the Sig P365-380

Published on November 29, 2023
Duration: 11:22

This video by Chris Baker of Lucky Gunner Ammo delves into the reliability of the Sig P365-380, particularly its sensitivity to ammunition and grip. Using high-speed camera analysis, Baker demonstrates how factors like slide velocity, bullet weight, and grip pressure directly impact the firearm's ability to cycle and eject spent casings, leading to potential malfunctions. The review highlights that not all .380 ACP ammunition performs equally well in this platform and emphasizes the importance of thorough testing with chosen carry loads.

Quick Summary

The Sig P365-380's reliability is sensitive to ammunition and grip due to the limited energy of the .380 ACP cartridge. A firm grip is essential to achieve sufficient slide velocity for proper ejection. Heavier-for-caliber bullets (90gr+) and hollow point (JHP) ammunition generally perform better, while muzzle energy alone is not a reliable indicator of performance.

Chapters

  1. 00:02Introduction: Sig P365-380 Review
  2. 00:28P365-380 vs 9mm P365 Comparison
  3. 00:53Reliability Issues with Modern .380s
  4. 01:25Initial Testing and Failures to Eject
  5. 01:54Soft Grip and Cycling Issues in .380s
  6. 02:36Simulating Malfunctions and Comparative Tests
  7. 03:42High-Speed Footage: Slide Velocity and Ejection
  8. 05:02Mechanism of Weak Ejection and Failures
  9. 05:37Threshold for Reliable Ejection
  10. 06:10Ammo Energy vs. Reliability (Federal Lead-Free)
  11. 06:39Bullet Weight's Impact (Federal HST)
  12. 07:23Ammo Selection and Reliability Predictability
  13. 08:01Test Limitations and Disclaimers
  14. 08:39Key Trends in Reliability for .380 Pistols
  15. 10:10Recommendations for Carry Ammo Testing
  16. 10:47Conclusion: P365-380 Shootability and Testing Effort

Frequently Asked Questions

What causes reliability issues in the Sig P365-380?

The Sig P365-380, like many modern .380 ACP pistols, uses a locked-breech, recoil-operated system. The .380 cartridge has limited energy, making the firearm sensitive to variations in ammunition, grip strength, lubrication, and manufacturing tolerances, which can lead to malfunctions like failures to eject.

How does grip affect the Sig P365-380's reliability?

A firm, high grip on the backstrap is crucial for the Sig P365-380 to cycle reliably. A loose or weak grip significantly reduces slide velocity, preventing the slide from fully cycling and ejecting spent casings, often resulting in failures to eject.

What type of .380 ACP ammunition is recommended for the Sig P365-380?

Testing indicates that heavier-for-caliber bullets (90-grain or heavier) and hollow point (JHP) ammunition tend to improve reliability in the Sig P365-380. Loads with more felt recoil also performed better, suggesting they provide sufficient energy for cycling.

Is muzzle energy a good indicator of .380 ACP reliability?

No, muzzle energy alone does not directly predict slide velocity or reliability. Factors like powder burn rate and case dimensions are also critical. For example, a lighter bullet with higher muzzle velocity might not cycle the action as effectively as a heavier bullet with slightly lower velocity.

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