9mm Revolver: Crimp Jump Testing (Bullet Creep)

Published on January 17, 2017
Duration: 12:42

This video provides a comprehensive test of various 9mm ammunition types in a semi-automatic caliber revolver, specifically addressing the issue of crimp jump or bullet creep. The instructor, TheYankeeMarshal, details his testing methodology and categorizes ammunition based on its performance, distinguishing between rounds suitable for range use, self-defense, and those that fail entirely due to bullet setback. The findings highlight the critical importance of testing ammunition in revolvers chambered for semi-automatic rounds to ensure reliability.

Quick Summary

Crimp jump or bullet creep in 9mm revolvers occurs when bullets setback into the case during firing cycles. Testing by TheYankeeMarshal showed Hornady Critical Defense/Duty, Speer Gold Dot, and Corbon DPX performed well, while Barnes, Blazer Brass, Corbon 125gr, and Liberty Defense failed significantly.

Chapters

  1. 00:00Introduction to Semi-Auto Revolvers & Crimp Jump
  2. 01:02Testing Methodology Explained
  3. 03:089mm Ammunition Tested: Full List
  4. 04:03Barnes Tac XPD Plus P 150gr: Fail
  5. 04:35Blazer Brass 115gr FMJ: Fail
  6. 05:05Corbon Plus P 125gr JHP: Fail
  7. 05:49Corbon DPX 115gr: Pass
  8. 06:21Hornady Critical Defense 115gr FTX: Pass
  9. 06:59Hornady Critical Duty 135gr Plus P: Pass
  10. 07:27Liberty Defense USM4 50gr: Fail
  11. 08:19Speer Gold Dot 124gr JHP: Pass
  12. 09:04Underwood Plus P 115gr Extreme Penetrator: Pass
  13. 09:52Winchester White Box 115gr/124gr FMJ: Range Use
  14. 10:49Conclusion: Importance of Testing Ammo
  15. 11:20Top Recommended Ammunition

Frequently Asked Questions

What is crimp jump or bullet creep in revolvers?

Crimp jump, or bullet creep, is a phenomenon in revolvers chambered for semi-automatic cartridges where repeated firing cycles can cause bullets to setback into the cartridge case. This can lead to dangerous pressure increases or firearm malfunctions, making it a critical concern for reliability.

How was ammunition tested for crimp jump in 9mm revolvers?

The test involved loading ammunition into moon clips and repeatedly cycling the rounds through the revolver's action up to three times without firing. Bullet setback was then measured using calipers and compared to unfired rounds to assess performance.

Which 9mm ammunition brands performed best for semi-automatic revolvers?

Hornady Critical Defense 115gr FTX and Hornady Critical Duty 135gr Plus P performed exceptionally well with no measurable movement. Speer Gold Dot 124gr JHP and Corbon DPX 115gr also passed, showing minimal setback, making them suitable for self-defense.

Which 9mm ammunition brands failed the crimp jump test for revolvers?

Several brands failed, including Barnes Tactical XPD Plus P 150gr, Blazer Brass 115gr FMJ, Corbon Plus P 125gr JHP, and Liberty Defense USM4 50gr. These often exhibited significant bullet setback, case separation, or complete failure after minimal cycling.

Is Winchester White Box ammunition suitable for 9mm revolvers?

Winchester White Box 115gr and 124gr FMJ passed for range use, showing some setback but not enough to jam the gun. However, it is not recommended for self-defense due to potential reliability issues with crimp jump after multiple cycles.

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