Why Did The Police Ditch .40 Cal?

Published on December 31, 2022
Duration: 27:57

This guide explains the historical shift in police handgun calibers, detailing why agencies moved from 9mm to .40 S&W and are now returning to 9mm. It highlights advancements in ammunition technology and practical advantages that make modern 9mm a viable, and often preferred, choice for law enforcement. The information is presented with insights from former law enforcement and firearms instructors.

Quick Summary

Law enforcement agencies are returning to 9mm from .40 S&W due to significant advancements in modern ammunition technology. These new 9mm rounds offer terminal ballistics comparable or superior to older .40 S&W loads, combined with practical benefits like higher capacity and reduced recoil.

Chapters

  1. 00:00Introduction Skit
  2. 01:18The Shift Back to 9mm
  3. 02:38Historical Context: 1986 Miami Shootout
  4. 04:04The Rise and Fall of 10mm and .40 S&W
  5. 05:50Modern Ballistic Advancements
  6. 07:41Penetration and Hollow Point Tech
  7. 09:17Expansion and Scoring Comparisons
  8. 11:11Medical and Forensic Perspectives
  9. 12:37Practical Advantages of 9mm

Frequently Asked Questions

Why are police departments switching back to 9mm from .40 S&W?

Law enforcement agencies are returning to 9mm due to significant advancements in modern ammunition technology. These new 9mm rounds offer terminal ballistics comparable or superior to older .40 S&W loads, combined with practical benefits like higher capacity and reduced recoil.

What historical event led to the adoption of .40 S&W by law enforcement?

The 1986 Miami Shootout was a major catalyst. The perceived failure of 9mm rounds to immediately incapacitate suspects prompted the FBI to seek more powerful options, initially adopting 10mm and later developing the more manageable .40 S&W.

How does modern 9mm ammunition compare to .40 S&W in terms of performance?

According to FBI research from 2014, modern 9mm ammunition, especially with advanced hollow-point designs, achieves terminal ballistics, penetration, and expansion that are comparable or superior to older .40 S&W and .45 ACP loads.

What are the practical advantages of 9mm over .40 S&W for police use?

9mm offers higher magazine capacity, less felt recoil for faster follow-up shots, reduced wear on firearms, and lower ammunition costs for training. These factors contribute to improved officer performance and efficiency.

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