Firing the Wrong Caliber

Published on December 5, 2013
Duration: 10:27

This video demonstrates the dangerous consequences of firing incorrect ammunition calibers in firearms. Experienced instructor Matt Carriker shows how .380 ACP in a 9mm firearm and 9mm in a .40 S&W firearm can lead to cycling failures and severe brass deformation due to improper headspacing. The experiment highlights the critical importance of using the correct ammunition for each firearm to ensure safe operation and prevent damage.

Quick Summary

Firing the wrong caliber ammunition in a firearm is extremely dangerous. It can lead to malfunctions like stovepipe jams, severe brass deformation (bulging), and potentially catastrophic firearm failure, risking serious injury. Always use the correct ammunition specified for your firearm.

Chapters

  1. 00:00Introduction to Caliber Testing
  2. 00:16Comparing .380 ACP and 9mm
  3. 01:21Firing .380 in 9mm Ruger P85
  4. 02:05Preparing 9mm in .40 S&W Glock 23
  5. 03:52Testing 9mm in .40 Glock: Bulged Brass
  6. 04:51Loading .223 into .40 Glock
  7. 07:22Firing .223 from .40 Glock: Deformation
  8. 08:48.223 Rifle Fire Comparison

Frequently Asked Questions

What happens if you fire a .380 ACP round in a 9mm firearm?

Firing a .380 ACP in a 9mm firearm typically results in a failure to cycle the action. The shorter .380 case may not generate enough energy to push the slide back fully, potentially leaving the spent casing stuck in the chamber, leading to a stovepipe jam.

Can you safely fire 9mm ammunition from a .40 S&W handgun?

No, it is extremely dangerous and unsafe to fire 9mm ammunition from a .40 S&W handgun. The 9mm case is smaller than the .40 S&W chamber, leaving it unsupported during firing, which can cause severe brass bulging and potentially damage the firearm or cause injury.

What are the risks of firing the wrong caliber ammunition?

The risks include catastrophic firearm failure, such as the firearm exploding, severe brass deformation (bulging or case head separation), failure to cycle, stovepipe jams, and potentially serious injury or death to the shooter and bystanders.

Why do .380 ACP and 9mm have similar bullet diameters but different compatibility?

.380 ACP and 9mm bullets are often very close in diameter, but their cartridge cases differ significantly in length and pressure ratings. The 9mm case is longer and designed for higher pressures, making it incompatible with firearms chambered for .380 ACP, and vice-versa.

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