Difference between revisions of ".950 JDJ"

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[[File:950-JDJ-SSK-Industries-Compared-22-Long-Rifle-223-30-06-Firearm-Wiki.jpg|frame|right|An image comparing the .950 JDJ to several other cartridges including a .22 Long Rifle, .223 Remington and .30-06 Springfield.]]
 
[[File:950-JDJ-SSK-Industries-Compared-22-Long-Rifle-223-30-06-Firearm-Wiki.jpg|frame|right|An image comparing the .950 JDJ to several other cartridges including a .22 Long Rifle, .223 Remington and .30-06 Springfield.]]
  
The '''950 JDJ''' is one of the most powerful rifle cartridges ever developed as of 2019. It was designed by J.D. Jones of [[SSK Industries]] but is primarily a custom novelty that was originally intended for a customer who wanted an extremely powerful and large-caliber rifle that could shoot cast bullets. It is ''not'' a production cartridge, and only 3 rifles chambered in .950 JDJ have ever been produced.
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The '''950 JDJ''' is one of the most powerful rifle cartridges ever developed in the area of sporting rifles. It was designed in  by J.D. Jones of [[SSK Industries]] but is primarily a custom novelty that was originally intended for a customer who wanted an extremely powerful and large-caliber rifle that could shoot cast bullets. It is ''not'' a production cartridge, and only 3 rifles chambered in .950 JDJ have ever been produced.
  
The case is based on the [[20mm Vulcan]], trimmed down to a 70mm case length and necked up for a .95 caliber projectile.
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The case is based on the [[20mm Vulcan]], trimmed down to a 70mm case length and necked up for a .95 caliber (24.1mm) projectile . Though some sources claim the cartridge may actually be based on the [[20x110mm Hispano]], a French anti-aircraft cartridge.
  
  

Revision as of 10:11, 5 November 2019

An image comparing the .950 JDJ to several other cartridges including a .22 Long Rifle, .223 Remington and .30-06 Springfield.

The 950 JDJ is one of the most powerful rifle cartridges ever developed in the area of sporting rifles. It was designed in by J.D. Jones of SSK Industries but is primarily a custom novelty that was originally intended for a customer who wanted an extremely powerful and large-caliber rifle that could shoot cast bullets. It is not a production cartridge, and only 3 rifles chambered in .950 JDJ have ever been produced.

The case is based on the 20mm Vulcan, trimmed down to a 70mm case length and necked up for a .95 caliber (24.1mm) projectile . Though some sources claim the cartridge may actually be based on the 20x110mm Hispano, a French anti-aircraft cartridge.


Ballistics

There are mixed reports on the exact ballistics of the .950 JDJ cartridge.

Some cite a 3600 grain projectile at 2200 feet per second which would generate 38,700 ft lbs of energy at the muzzle. Others (such as Ian McCollum of Forgotten Weapons) mention a 2600 grain projectile at 2200 feet per second for a more "modest" 27,950 ft lbs of energy at the muzzle.

It's possible the former figure is simply misquoted.


References & Resources

An excellent video by Ian McCollum of Forgotten Weapons discussing the .950 JDJ, and the "Fat Mac", one of three rifles ever chambered in the cartridge, weighing in at a whopping 60 pounds.