"Fat Mac" - SSK Industries' .950 JDJ Rifle

Published on October 7, 2025
Duration: 1:06

The .950 JDJ rifle, nicknamed 'Fat Mac', is a custom build by SSK Industries featuring the largest sporting purpose cartridge. Its 24.1mm cartridge, derived from a 20mm Vulcan case, fires a 2600-grain bullet at 2200 fps. Despite its caliber exceeding the .50 BMG limit for typical registration, it received an ATF sporting purpose exemption. The rifle's massive muzzle brake is highly effective, capable of generating significant muzzle blast.

Quick Summary

The .950 JDJ rifle, nicknamed 'Fat Mac', uses the largest sporting purpose cartridge, firing a 2600-grain bullet at 2200 fps. It's built on a shortened 20mm Vulcan case and received an ATF sporting purpose exemption, bypassing typical destructive device registration for firearms over .50 caliber.

Chapters

  1. 00:00Introduction to the .950 JDJ Rifle
  2. 00:14.950 JDJ Cartridge Technical Details
  3. 00:34ATF Exemption for .950 JDJ
  4. 00:55Muzzle Brake Performance Demonstration

Frequently Asked Questions

What makes the .950 JDJ rifle unique?

The .950 JDJ, nicknamed 'Fat Mac', is notable for using the largest sporting purpose cartridge ever developed. It fires a 2600-grain bullet at 2200 fps and required a special ATF exemption due to its caliber exceeding .50 BMG.

How was the .950 JDJ cartridge created?

The cartridge is made from a 20mm Vulcan brass case that has been cut down to 70mm in length and then necked up to accept a .95 caliber (24.1mm) projectile.

Did the .950 JDJ rifle require special legal approval?

Yes, firearms over .50 caliber are typically registered as destructive devices. However, JD Jones of SSK Industries obtained a specific sporting purpose exemption from the ATF for the .950 JDJ.

How effective is the .950 JDJ's muzzle brake?

The muzzle brake on the .950 JDJ is extremely powerful. Visual evidence shows it redirects gas with such force that it can shred a tablecloth placed beneath the rifle during firing.

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