The Craziest Bullet Used During WW2

Published on July 4, 2025
Duration: 12:25

This video details the unique .303 British B-IV Mark 4 incendiary bullet used in WW2. It explains the complex centrifugal air-induction mechanism that ignites white phosphorus mid-flight for incendiary effects. Tests demonstrate its effectiveness against fuel tanks and wood, and its distinct visual impact in ballistic gel and flight.

Quick Summary

The .303 British B-IV Mark 4 was a unique WW2 incendiary bullet using white phosphorus. Its centrifugal air-induction mechanism ignited the phosphorus mid-flight. Tests showed it effectively ignited fuel tanks and created large cavities in ballistic gel, unlike standard rounds.

Chapters

  1. 00:00Intro: .303 British B-IV Mark 4
  2. 00:24Incendiary Mechanism Explained
  3. 00:59Fuel Tank Testing
  4. 05:20Lumber and Flammability Test
  5. 06:57Purpose of the Rib
  6. 07:40Ballistic Gel Comparison
  7. 09:22Cleaning Corrosive Ammunition
  8. 11:43Long-Range Smoke Trail

Frequently Asked Questions

What made the .303 British B-IV Mark 4 bullet unique during WW2?

The .303 British B-IV Mark 4 was unique due to its incendiary capability, utilizing white phosphorus filler. It featured a complex centrifugal air-induction mechanism that ignited the phosphorus mid-flight, creating a significant fire hazard.

How did the B-IV Mark 4 bullet ignite its white phosphorus?

The bullet's spin generated centrifugal force, causing two small plugs to dislodge. This allowed air to enter the internal channels, reacting with the white phosphorus filler and igniting it during flight.

What was the purpose of the external rib on the B-IV Mark 4 bullet?

The external rib was designed by the British Royal Air Force to help cut larger holes in the fabric of barrage balloons. This ensured more hydrogen escaped, which could then be ignited by the bullet's phosphorus payload.

How did the B-IV Mark 4 perform in ballistic gel tests compared to standard rounds?

In ballistic gel, the B-IV round created a massive temporary cavity and left a distinct smoke trail within the gel. This visual effect highlighted its incendiary nature and internal damage potential, unlike standard ball ammunition.

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