.950 JDJ

Large caliber rifle cartridge .950 JDJ United States Rifle J. D. Jones SSK Industries/Knight Rifles 20×102mm Vulcan 0.950 in mm on 2.75 in mm on 3600 2200 38685 The .950 JDJ (24.1×70mm) is a powerful large caliber rifle cartridge developed by American gunsmith and weapon designer J. D. Jones of SSK Industries. It is considered to be the most powerful sporting rifle ever produced.What is the Biggest Hunting Rifle? Exploring the .950 JDJ and Its Eyebrow-Raising Specifications https://www.battlbox.com/blogs/hunting/what-is-the-biggest-hunting-rifle-exploring-the-950-jdj-and-its-eyebrow-raising-specifications?srsltid=AfmBOopHVi2rE3tYGZMEkG4UPNjd6vmSfz1CDlQvsUfcT8ZgovKKkJIk Battle Box © Battlbox,LLC. 29 December 2025 Cartridge .950 JDJ cases are approximately 70 mm in length, and are based on a 20×102mm Vulcan case shortened and necked up to accept the .950 in mm on bullet. Projectiles are custom-made and most commonly weigh 3600 gr which is 8.2 ounces or over half a pound. Rifles As its name implies, rifles chambered for the cartridge have a groove diameter of 0.950 in mm on. In the United States, SSK received a "Sporting Use Exception" from the ATF to de-regulate the rifle. Normally firearms with a rifled barrel having a bore size over 0.50 inches are strictly regulated as Destructive Devices by the National Firearms Act and Title II of the Gun Control Act of 1968, requiring ATF approval prior to purchase, manufacture, or transfer, which is granted only after passing an enhanced background check (which includes submitting a photo and fingerprint card) and paying a $200 tax, with the destructive device being registered to the person/entity it is transferred to.WHAT ARE “FIREARMS” UNDER THE NFA? National Firearms Act Handbook April 2009 5320.8 2.1.8 Destructive device 16-19 https://www.atf.gov/firearms/docs/undefined/atf-national-firearms-act-handbook-chapter-2/download 29 December 2025 Bureau of Alcohol, Tobacco, Firearms and ExplosivesNational Firearms Act https://www.atf.gov/rules-and-regulations/laws-alcohol-tobacco-firearms-and-explosives/national-firearms-act ATF.gov Bureau of Alcohol, Tobacco, Firearms and Explosives 29 December 2025 14 March 2025 However, a firearm that would otherwise be required to be registered and regulated as a Destructive Device, can be granted a Sporting Use Exception if it is primarily designed for sporting use and the ATF determines it is unlikely to be used as a weapon.§ 479.11 Meaning of terms https://regulations.atf.gov/479-11/2023-01001#479-11-p3465676471 27 CFR § 479.11: ATF eRegulations Bureau of Alcohol, Tobacco, Firearms and Explosives 29 December 2025 Destructive Device 14 March 2025 Thus, since the .950 JDJ was granted a sporting exception, it is regulated as a Title I rifle by the GCA and can be purchased and owned by any American citizen or lawful permanent resident who is at least 18, has filled out an ATF Form 4473 Firearm Transaction Record and passed a standard background check.Kolander Joel R. The .950 JDJ Returns: Shooting the Fat Mac https://www.rockislandauction.com/riac-blog/shooting-fat-mac-the-950-jdj-rifle/ Rock Island Auctions © Rock Island Auction Company 29 December 2025 Bedford, TX 3 November 2017 However, the .950 JDJ is not legal in all states, some states like California, Illinois, Massachusetts and Washington D.C. specifically ban the .50 BMG as an "assault weapon", as well as all other rifles with a bore size over either .50 or .60 caliber (the exact threshold varies by state) and prohibit their sale or transfer to civilians, while other states like Delaware and Maryland only ban specific rifles like the Barrett .50 BMG and have restrictions on other large bore rifles requiring either a permit or registration; some cities and counties also ban them even if their state doesn't, one is advised to check local laws before purchasing any large bore rifle.McBride Cassandra Banned & Restricted Guns & Ammo List: A 2025 Review by State https://ammo.com/research/list-of-banned-guns-and-ammo-by-state#assault-weapon-bans Ammo.com 29 December 2025 24 September 2025State Firearm Laws and Published Ordinances - California https://www.atf.gov/firearms/docs/guide/california-firearms-statutes-and-codes/download ATF California Firearm Regulations California Department of Justice 29 December 2025 July 2020Assault Weapon Identification Guide https://isp.illinois.gov/StaticFiles/docs/Home/AssaultWeapons/PICA%20Emergency%20Rule%20Register.pdf State of Illinois Illinois State Police 29 December 2025 1 October 2023 The rifles use stocks and extraordinarily thick Krieger barrels bearing an 18 lb on muzzle brake.Barnes Frank C. Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges https://books.google.com/books?id=02CYCAAAQBAJ&pg=PA416 14th 19 December 2014 F+W Media, Inc. Iola, Wisconsin 978-1-4402-4265-6 416 Overall, depending on options, the rifles weigh from 85 to 120 lb and are therefore only useful for shooting from a bench rest or heavy bipod.McBros 95 caliber rifle single-shot bolt-action rifle, Securityarms.com Despite the weight, recoil is significant and shooters must be sure to choose components (i.e., scopes and bipods) that can handle the force. The sheer size, weight, and power of these rifles make them rather impractical for hunting use. SSK only manufactured three of these rifles and as of 2014 no longer produces the ammunition.Rottman Gordon L. The Big Book of Gun Trivia: Everything you want to know, don't want to know, and don't know you need to know https://books.google.com/books?id=wZ0eDAAAQBAJ&pg=PT288 2013 Bloomsbury Publishing 978-1-78200-950-4 288 Ballistics The cartridge propels its 3,600 gr 0 off bullet at approximately 2,200 ft/s m/s off, it would take 45 .223 Remington bullets (80 grain) and 24 .308 Winchester bullets (150 grain) to equal the weight of a .950 JDJ bullet.DeShields, Jr. Scott The 950 JDJ FAT MAC (The World’s Most Powerful Rifle!!!) https://www.youtube.com/watch?v=Xlv0SK-vpow YouTube Kentucky Ballistics 29 December 2025 7:10 Video 8 April 2024 This yields a muzzle energy of 38,685 ft.lbf J 0 off.http://soldiersystems.net/2014/02/25/ssk-industries-950-jdj-largest-centerfire-rifle-ever-made/ The SSK Industries .950 JDJ – The Largest Centerfire Rifle Ever Made 2014 SoldierSystems By comparison, the 5.56×45mm NATO cartridge, used in the M16 and M4 rifles, produces between 1,200 - 1,300 ft.lbf J off,5.56 Ballistics Charts From Every Major Ammunition Manufacturer https://ammo.com/ballistics/5.56-ballistics Ammo.com 29 December 2025 while the .308 Winchester, a favorite for hunters, police, and military snipers, produces between 2000 - 3000 ft.lbf J off depending on the load used.308 Ballistics Charts For Major Ammo Manufacturers https://ammo.com/ballistics/308-ballistics Ammo.com 29 December 2025 Even the .50 BMG, which has a kinetic energy of around 13,000 - 15,000 ft.lbf J off delivers less than half the energy. The ballistics of the .950 JDJ are more similar to that of the 20 mm autocannon round, which delivers approximately 39500 ft.lbf J off. The muzzle energy of the .950 JDJ is comparable to the kinetic energy of a 2800 lb off automobile traveling at 20 mph km/h off. In a 110 lb on rifle, this will develop well over 200 ft.lbf J off of free recoil energy. Shooting usually involves a heavy "lead sled" or similar shooting rest, and the rifle scope has significant eye relief to avoid injuring the ocular orbit. References External links "Fat Mac" - SSK Industries' .950 JDJ Rifle Forgotten Weapons Category:Pistol and rifle cartridges Category:Large-caliber cartridges Category:JDJ cartridges