Deflagrazine vs Detonazione #balistica

Published on April 11, 2025
Duration: 7:52

This video explains the dangerous phenomenon of Deflagration to Detonation Transition (DDT) in firearms. Professional gunsmith Guido details how gunpowder normally deflagrates, creating controlled pressure. He warns that DDT, where gunpowder detonates, can occur due to improper loading, especially with low powder charges in long cases, leading to catastrophic firearm failure. The video emphasizes meticulous reloading practices to avoid this risk.

Quick Summary

Deflagration to Detonation Transition (DDT) is a dangerous event where gunpowder unexpectedly detonates instead of deflagrating. This can occur due to improper powder charges, poor distribution, or fast propellants, especially in long cases. Meticulous reloading practices are crucial to prevent this catastrophic failure.

Chapters

  1. 00:00Introduction: Powder Charge Risks
  2. 00:14Welcome & Series Overview
  3. 00:36Introducing DDT: The Dangerous Event
  4. 01:00How Pressure is Released
  5. 01:40Deflagration vs. Detonation Explained
  6. 02:04Propellant Burn Rate
  7. 02:28Detonants vs. Deflagrants
  8. 02:57The Ignition Process
  9. 03:34DDT: The Perfect Storm
  10. 04:17Consequences of Detonation in Barrel
  11. 04:33Real-World DDT Cases
  12. 04:53Conditions for DDT
  13. 05:22DDT Risk in Revolvers/Carbines
  14. 05:54'Fuoco Lungo' Explained
  15. 06:06How to Avoid DDT
  16. 06:35Reloading Advice for DDT Prevention
  17. 07:04Conclusion of Series

Frequently Asked Questions

What is Deflagration to Detonation Transition (DDT) in firearms?

DDT is a rare but dangerous phenomenon where gunpowder, designed to burn (deflagrate) at subsonic speeds, transitions to detonating at supersonic speeds. This rapid, shockwave-driven explosion can cause catastrophic failure of the firearm.

What factors can contribute to DDT in ammunition?

DDT can be caused by several factors, including incorrect powder charges (too little or too much), poor powder distribution within the case, overly powerful primers, and specific propellant burn rates. Low charges in long cases are particularly risky.

Why are low powder charges in long cases a risk for DDT?

In long cases, a low powder charge may not fill the case adequately. This allows the primer's flame to ignite the entire powder charge simultaneously, bypassing the intended controlled deflagration and increasing the likelihood of a detonation.

How can reloaders prevent DDT?

Reloaders can prevent DDT by using appropriate propellants with the correct burn rate and progression for the cartridge, ensuring accurate powder measurement, and meticulously following established reloading safety protocols to avoid undercharging or overcharging.

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