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

Published on October 7, 2025
Duration: 1:06

This video from Forgotten Weapons showcases the SSK Industries .950 JDJ rifle, also known as the 'Fat Mac'. Expert Ian McCollum details its immense cartridge, derived from a shortened 20mm Vulcan case, firing a 2600-grain bullet at 2200 fps. The discussion highlights JD Jones's successful ATF exemption for sporting purposes, circumventing NFA regulations for firearms over .50 caliber. The rifle's massive muzzle brake is also demonstrated, emphasizing its significant gas redirection capabilities.

Quick Summary

The SSK Industries .950 JDJ rifle, or 'Fat Mac', is notable for its custom cartridge based on a shortened 20mm Vulcan case, firing a 2600-grain bullet at 2200 fps. JD Jones obtained an ATF sporting purpose exemption, making it legal despite exceeding the .50 caliber limit for destructive devices. Its powerful muzzle brake is also a key feature.

Chapters

  1. 00:00Introduction to the .950 JDJ
  2. 00:14Cartridge Technical Details
  3. 00:34Legal Status and ATF Exemption
  4. 00:55Muzzle Brake Performance

Frequently Asked Questions

What makes the SSK Industries .950 JDJ rifle unique?

The .950 JDJ, nicknamed 'Fat Mac', is unique due to its custom cartridge, derived from a shortened 20mm Vulcan case, and its classification as the largest sporting purpose rifle, legally circumventing NFA 'destructive device' rules via an ATF exemption.

How was the .950 JDJ rifle made legal despite its caliber?

JD Jones of SSK Industries secured a specific 'sporting purpose exemption' from the ATF for the .950 JDJ. This allowed the rifle, which exceeds the .50 caliber threshold for destructive devices, to be legally manufactured and sold for sporting applications.

What are the key technical specifications of the .950 JDJ cartridge?

The .950 JDJ cartridge features a 70mm case (shortened 20mm Vulcan), necked up to .95 caliber. It fires a 2600-grain bullet at a muzzle velocity of approximately 2200 feet per second.

How effective is the muzzle brake on the .950 JDJ rifle?

The muzzle brake on the .950 JDJ is extremely effective, designed to manage the immense recoil and muzzle blast. Its power was visually demonstrated by its ability to shred a tablecloth placed beneath the rifle during firing.

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