Jdj cartridges

The cartridge propels its 3,600 gr (230 g) bullet at approximately 2,200 ft/s (670 m/s). This yields a muzzle energy of 38,685 ft·lbf (52,450 J) [1] and a momentum of 154.1 Newton-seconds, about the same as a 20×102mm Vulcan round.

The cartridge propels its 3,600 gr (230 g) bullet at approximately 2,200 ft/s (670 m/s). This yields a muzzle energy of 38,685 ft·lbf (52,450 J) [1] and a momentum of 154.1 Newton-seconds, about the same as a 20×102mm Vulcan round.JD Jones’ .950 JDJ cartridge is a generally described as the largest sporting rifle cartridge ever produced, producing more energy than even the 4-bore cartridges that match it in bore diameter. Only three of these rifles were made, and the original loading was a 2600 grain (168g) cast bullet moving at 2200 fps (670m/s), for a … The .30-06 JDJ is a modified .30-06 Springfield cartridge designed to be used in the Thompson Center Arms Contender single-shot pistol. The idea behind it is to replicate the ballistics of a .30-06 fired from a rifle in a Contender pistol. [1] Currently, the .30-06 JDJ is not offered by any manufacturers. 25 Oct 2017 ... Say hello to Fat Mac, a behemoth of a rifle chambered in .950 JDJ. SHOOTING VIDEO IS HERE: https://youtu.be/ROd1_S-4c6Q Follow us! Best known is his family of cartridges made by necking down the .444 Marlin case and fireforming to a bit less body taper and a 40-degree shoulder. Among those, my favorite is the .309 JDJ (.308-inch bullet), although I also enjoy hunting with SSK barrels chambered for the 8mm, .358 and .375 littermates. Nov 4, 2008 · From the data I have on these 3 cartridges it looks like the 7X30 JDJ (aka 7-30 Waters Improved) will do anything the other two cartridges will do in a Contender but with less powder and less recoil. If you were going to have my barrel rechambered for a 7mm Cartridge which would be your choice and why.

The 14.5mm JDJ was created by SSK Industries of Wintersville, Ohio. Overview. It uses the .50 BMG case with the neck opened up to accept a .585 in (14.9 mm) bullet. It fires the 1,173-grain (76.0 g) bullet at 2,700 ft/s (820 m/s) with the fire-formed load. The Barnes 750-grain (49 g) bullet can also be loaded to 3,000 ft/s (910 m/s). If you own an HP printer, there’s a good chance that you rely on it for important documents or personal projects. However, like any other piece of technology, printers can sometime...This cartridge was innovative and effective, but would become obsolete by the end of the war, and no serious effort was made to continue making Burnside carbines ... “Fat Mac” – SSK Industries’ .950 JDJ Rifle. Related Articles. Aircraft MGs British .303 Browning Mk II* Aircraft Machine Gun October 19, 2021 Ian McCollum ...Shoulder angle is 60 degrees, which works fine. Body taper is minimal, similar to Ackley's improved designs. Therefore, this is a maximized version of the 30-06 case. Capacity is a whopping 75 grains of water, which is significantly greater than the 30-06 (about 70). Working pressure is about 60,000 psi, so ballistics are quite impressive.The biggest bullet caliber is the .950 JDJ, a custom-made rifle cartridge developed by the American firearms company SSK Industries. It is designed to be one of the largest and most powerful rifle cartridges in existence. What is the most powerful bullet caliber? The .950 JDJ is considered one of the most powerful rifle cartridges in the world.Apr 14, 2009 · The .416 JDJ was desigend expressly for use in the Contender. The Marlin lever-gun will handle the pressure/backthrust of the .416 JDJ, but I seriously doubt that it would handle the overall cartridge length. JD tends to design cartidges with the bullets seated pretty far out of the case to maximize powder capacity and hold pressures down. .950 JDJ cases are approximately 70 mm in length, and are based on a 20x110mm case shortened and necked up to accept the .950 in (24.1 mm) bullet. Projectiles are custom-made and most commonly weigh 3,600 grains (230 g) which is 8.2 oz. or over half a pound. This piece is pretty big. 2x2x6.

Custom aftermarket Contender® barrels chambered in JDJ calibers, specifically designed for hunting purposes, soon became the major product of the firm. These barrels and cartridges, unequalled in the Contender® in accuracy, have truly effective big game harvesting ability. Over the years better bullets and optics have simply made them better.375 JDJ was designed by J.D. Jones of SSK Industries in 1978 as a handgun hunting wildcat cartridge. By the term “wildcat”, we mean rounds that are traditionally very custom rounds with little mainstream production. The 375 JDJ may still be considered a Wildcat round due to its low production, but is one of the more popular wildcats available. Designed. 1990s. Manufacturer. SSK Industries. The Whisper family of firearm cartridges is a group of wildcat cartridges developed in the early 1990s by J.D. Jones at SSK Industries. The Whisper family was developed as a line of accurate, multi-purpose cartridges using relatively heavy rifle bullets for a given caliber in subsonic loads. The .375 JDJ was introduced in 1978 and was the first of six cartridges eventually developed on the .444 Marlin case by J.D. Jones of SSK Industries for the Thompson/Center Contender single-shot pistol. With the exception of their bullet diameters, the .309, 8mm, .338, .358, .375 and .416 JDJ cartridges are the same.

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not only the 6.5mm JDJ, but the 6.5mm JDJ x 30 and the 6.5mm JDJ #2. In addition, he has created the 6.5mm Whisper, a cartridge with quite interesting subsonic performance. The 6.5mm JDJ is a cartridge with excellent long range (up to 300 yards) smaller big game handgun hunting potential. Based on the 225 Winchester case, itThe .950 JDJ (shown here next to 5.56mm and 9mm cartridges) was based on the 20x110mm Vulcan Cannon cartridge, shortened, and necked up to match a .950 caliber (24.1mm) cast lead bullet. The original loading was a 2600 grain (168g) cast bullet moving at 2200 fps (670m/s), for a whopping 28,000 foot-pounds of muzzle energy.As crafted by SSK Industries, .950 JDJ rifles use McMillan stocks and very large-diameter Krieger barrels fitted with a massive 18.2-lb muzzle brakes. The ammo produced by SSK features solid 3,600 grain bullets and CNC-machined cartridge brass. It is also possible (through a lot of work), to use a 20mm cannon casing shortened and necked-down ...Cartridge Collector > Cartridges > IMPERIAL SPORTING RIFLE > IMPERIAL SPORTING .50" UPWARDS > 950 JDJ. 950 JDJ. The 950 JDJ was designed by J.D. Jones from SSK Industries in 1996 and was based on the 20mm Vulcan case that was shortened and necked down. The SSK Industries Fatmac Rifle that was featured on Rock Island Auctions

The cartridge propels its 3,600 gr (230 g) bullet at approximately 2,200 ft/s (670 m/s). This yields a muzzle energy of 38,685 ft·lbf (52,450 J) [1] and a momentum of 154.1 Newton-seconds, about the same as a 20×102mm Vulcan round.375 JDJ was designed by J.D. Jones of SSK Industries in 1978 as a handgun hunting wildcat cartridge. By the term “wildcat”, we mean rounds that are traditionally very custom rounds with little mainstream production. The 375 JDJ may still be considered a Wildcat round due to its low production, but is one of the more popular wildcats available.<NEW> List of Cartridges by Powder; Cartrige Powder Recommendations; Powder Burn Rate Chart; Primer Manufacturer Chart; Shellholder Chart; Bullet Abbreviations; User Loading Data. ... 6.5 mm JDJ - Published Manufacturer Loading Data Recipe Type: Pistol . Bullet Weight: ALL. 85 gr. 100 gr. 120 gr. 129 gr. 140 gr . Powder: ALL.Reduce all loads 10 percent and work up only as pressure signs permit. (Handloader Issue 149) Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .270 JDJ reloading data with 28 loads. Using bullets from Sierra HP, Speer HP, Hornady HP, Sierra spitzer, Nosler Ballistic Tip, Speer spitzer, Nosler Partition.13 Feb 2011 ... I see where someone else already mentioned the JDJ cartridges and for wildcats out of the Encore they'd be really hard to beat. I have been ...The .309 JDJ round is one of many wildcat cartridges created by J.D. Jones, the original founder of SSK Industries and one of the legends of the firearms industry. Unlike most of those legends, Mr. Jones is still with us. Jones took a 444 Marlin case, sharpened the shoulder angle and necked it down to .308″.ed hoening Discussion starter. 1 post · Joined 2006. #1 · Dec 14, 2006. im looking for a 416 jdj based on the 444 marlin case.If you have one to sell cotact me with details. thanks. Like. Sort by Oldest first.Meet the .950 JDJ. When it comes to a rifle cartridge, nothing is larger than the .950 JDJ, which uses 240 grains of powder to push a 2,400-grain bullet at 2,100 feet per second (FPS)..950 JDJ Worlds Largest "Sporting" Bullet As its name implies, rifles chambered for the cartridge have a bore diameter of 0.950 in (24.1 mm), which would normally classify them as Destructive Devices in the United States However, SSK sought and received a "Sporting Use Exception" to de-regulate the rifles, ...A .950 JDJ rifle can weigh upwards of 50 pounds or more due to the size and power of the cartridge. Is the .950 JDJ widely available? No, the .950 JDJ is not a commercially produced cartridge and is only available through custom gunsmiths and specialty ammunition manufacturers.

The 220 grain flat point bullets can be propelled as fast from the. 375 JDJ as from the. 375 Winchester big bore, making it an effective game cartridge. The 270 grain bullet can reach up to 2000 fps while three powders produced 1900 fps with the 300 grain bullet. Engineers call them tradeoffs, and the 375 JDJ has several.

Rifles chambered for the .950 JDJ are themselves behemoths, with weights ranging from 85 to 110 pounds, depending on configuration, and feature extraordinarily thick Krieger barrels equipped with massive 18-pound muzzle brakes. The rifles’ exceptional size and cost—the rifles themselves can fetch around $8,000, and each loaded cartridge ...Find in stock 375 jdj ammo from the top online retailers to find the lowest price. Find Bulk 375 jdj ammunition fast and cheap with our ammunition search engine. JavaScript seems to be disabled in your browser.Made by SSK Industries, the .950 JDJ is the largest sporting rifle made. The cartridge began as a 20mm Vulcan round, cut down to 70mm case length and necked ...HP ink cartridges are an essential component of any HP printer. Whether you’re a seasoned printer user or a beginner, knowing how to install these ink cartridges correctly is cruci...Subscribed. 35K. 3M views 6 years ago. Made by SSK Industries, the .950 JDJ is the largest sporting rifle made. The cartridge began as a 20mm Vulcan round, …The .30-06 JDJ is a firearm cartridge designed by J.D. Jones. The .30-06 JDJ is a modified .30-06 Springfield cartridge designed to be used in the Thompson Center Arms Contender single-shot pistol. The idea behind it is to replicate the ballistics of a .30-06 fired from a rifle in a Contender pistol.[1] Currently, the .30-06 JDJ is not offered by any manufacturers. …375 JDJ was designed by J.D. Jones of SSK Industries in 1978 as a handgun hunting wildcat cartridge. By the term “wildcat”, we mean rounds that are traditionally very custom rounds with little mainstream production. The 375 JDJ may still be considered a Wildcat round due to its low production, but is one of the more popular wildcats available.Cartridge : 257 JDJ Bullet : .257, 85, Nosler BalTip 43004 Useable Case Capaci: 40.266 grain H2O = 2.614 cm³ Cartridge O.A.L. L6: 2.500 inch = 63.50 mm Barrel Length : 20.0 inch = 508.0 mm Powder : Hodgdon VARGET Predicted data by increasing and decreasing the given charge, incremented in steps of 1.098% of nominal charge.

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The 375 JDJ was designed by J. D. Jones of SSK Industries in 1978 as a Wildcat Cartridge, formed from the 444 Marlin “Parent” cartridge used in the custom JDJ barrel for the T/C Contender. The 375 JDJ was a “Wildcat” cartridge, until 2004, when Thompson Centerfire (T/C) marketed this caliber as the “Hand Cannon”, for T/C Contender ...Apr 14, 2009 · The .416 JDJ was desigend expressly for use in the Contender. The Marlin lever-gun will handle the pressure/backthrust of the .416 JDJ, but I seriously doubt that it would handle the overall cartridge length. JD tends to design cartidges with the bullets seated pretty far out of the case to maximize powder capacity and hold pressures down. Cartridge : 257 JDJ Bullet : .257, 85, Nosler BalTip 43004 Useable Case Capaci: 40.266 grain H2O = 2.614 cm³ Cartridge O.A.L. L6: 2.500 inch = 63.50 mm Barrel Length : 20.0 inch = 508.0 mm Powder : Hodgdon VARGET Predicted data by increasing and decreasing the given charge, incremented in steps of 1.098% of nominal charge.The .416 JDJ was desigend expressly for use in the Contender. The Marlin lever-gun will handle the pressure/backthrust of the .416 JDJ, but I seriously doubt that it would handle the overall cartridge length. JD tends to design cartidges with the bullets seated pretty far out of the case to maximize powder capacity and hold pressures down. The .375 JDJ was introduced in 1978 and was the first of six cartridges eventually developed on the .444 Marlin case by J.D. Jones of SSK Industries for the Thompson/Center Contender single-shot pistol. With the exception of their bullet diameters, the .309, 8mm, .338, .358, .375 and .416 JDJ cartridges are the same. Jan 24, 2019 · A cartridge I selected is the .309 JDJ, one of the many top-performing wildcat creations by J.D. Jones of SSK Industries, an extremely knowledgeable ballistician, inventor and hunter. JD Jones’ .950 JDJ cartridge is generally described as the largest sporting rifle cartridge ever produced for arguably the strongest gun in the world for sporting purposes. Most Powerful Guns from J. D. Jones. Gunmaker, cartridge designer, and SSK Industries founder J. D. Jones forged a name for himself with quality hunting arms and ...I might add that the case to the right has not yet been fireformed, at which time a Ackley 40 degree shoulder will be imparted. The cartridge may also be referred to as a 7x307AI. Think twice, shoot once. Re: New to me SSK Contender barrel in 7mm JDJ#2 [ Re: Mech 8 ] #212156 01/30/2024 2:28 PM. Joined: Feb 2011. ….

The cartridge isn't particularly OAL critical, as long as it easily seats flush after forming and loading. I will be in the hunting woods next week, so I am anxious to get this squared away. dale53. .327 Meteor. Posts: …Reduce all loads 10 percent and work up only as pressure signs permit. (Handloader Issue 149) Be Alert: Publisher cannot be responsible for errors in published load data. Wt. .270 JDJ reloading data with 28 loads. Using bullets from Sierra HP, Speer HP, Hornady HP, Sierra spitzer, Nosler Ballistic Tip, Speer spitzer, Nosler Partition.22 Feb 2024 ... The 950 JDJ known as Fat Mac has achieved its own share of internet fame in recent years. Now, collectors had their opportunity to own the ...375 JDJ was designed by J.D. Jones of SSK Industries in 1978 as a handgun hunting wildcat cartridge. By the term “wildcat”, we mean rounds that are traditionally very custom rounds with little mainstream production. The 375 JDJ may still be considered a Wildcat round due to its low production, but is one of the more popular wildcats available.QUALITY CARTRIDGE BRASS 6.5 JDJ UNPRIMED 20/BAG. Item #: QC65JDJ. Price: $48.25. $2.41 per piece. Shipping: One flat fee of $12.95 per online order. Exclusions apply. Click for details.Leland CO2 Cartridges. Quantity: 50 Leland 8 Gram CO2 Cartridges. $25.00. QTY. Featured Products. RSA (REAR SLING ATTACHMENT) $75.00. Free Shipping! …Sep 6, 2023 · All of these types of custom rounds belong in a 14" or longer barrel. 1) Starting from a .30 Herrett barrel, rechamber to .30/30 Improved or .30 Alaskan. 2) Starting from a .30/30 barrel, rechamber to .308 Bellm. 3) .309 JDJ and its case capacity do not belong in a Contender barrel, handgun or rifle, in spite of SSK's hype to the contrary, but ... 17 Mar 2022 ... 10 Best Cartridges for Elk: Voted by the experts! ... The 950 JDJ FAT MAC (The World's Most Powerful Rifle!!!) ... TOP 5 Best Cartridges For Big- ...February 27, 2014. Ohio -based Firearm and cartridge manufacturer SSK Industries has unveiled their .950 JDJ rifle. Billed as the largest centerfire rifle ever made, only three of …QUALITY CARTRIDGE BRASS 6.5 JDJ UNPRIMED 20/BAG. Item #: QC65JDJ. Price: $48.25. $2.41 per piece. Shipping: One flat fee of $12.95 per online order. Exclusions apply. Click for details. Jdj cartridges, I would suggest .309 JDJ data as a starting point, then work up in the Encore. .30 Bellm is a sawed off .444 Marlin case 1.395″ long necked to .30 caliber, designed specifically for Illinois handgun deer hunting, which is restricted to cartridges 1.4″ long or less, must be .30 cal. or larger, and produce at least 500 ft/lbs muzzle energy ..., Crafted from a 20×102mm Vulcan cannon case, shortened and necked up to fit a .950 inch (24.1 mm) bullet, the .950 JDJ is a cartridge that redefines large caliber. The projectiles for this ..., J.D. Jones wrote an excellent article in the 6th edition of Cartridges of the World. While he covers the7x30 Waters based JDJ unfortunately he doesn't include a sample loading. He does state that it is ballistically the same as the 7mmJDJ#2 which is based on the 307 win cartridge., , The 14.5mm JDJ was created by SSK Industries of Wintersville, Ohio. Overview. It uses the .50 BMG case with the neck opened up to accept a .585 in (14.9 mm) bullet. It fires the 1,173-grain (76.0 g) bullet at 2,700 ft/s (820 m/s) with the fire-formed load. The Barnes 750-grain (49 g) bullet can also be loaded to 3,000 ft/s (910 m/s)., Jan 16, 2018 · JDJ LINEUP OF CARTRIDGES - 01/16/2018 7:25 AM. JD Jones developed I believe the most successful line of "wildcat" cartridges for the Contender which turned the handgun hunting world around setting it full speed ahead. Basically he came up with the "maximum yet safe" cartridge in about every caliber for the Contender package, developed several ... , 6.5 JDJ / 6.5mm JDJ Handgun Data (Using Nosler Bullets) reloading data with 36 loads. Using bullets from Nosler. Powders include Accurate, IMR, Alliant, Winchester, Hodgdon, Vihtavuori, Understanding 950 Jdj Cartridge Overview Of 950 Jdj Cartridge History. The 950 jdj cartridge was created by j. d. Jones in 1994. It is a straight-walled cartridge with a rim and was designed for use in the thompson center arms contender single-shot rifle. It is a massive cartridge, with a case length of 2. 5 inches and a bullet diameter of. 950 ..., As crafted by SSK Industries, .950 JDJ rifles use McMillan stocks and very large-diameter Krieger barrels fitted with a massive 18.2-lb muzzle brakes. The ammo produced by SSK features solid 3,600 grain bullets and CNC-machined cartridge brass. It is also possible (through a lot of work), to use a 20mm cannon casing shortened and necked-down ..., Carpe Diem. 772 posts · Joined 2005. #7 · Aug 30, 2021. The 7-30 JDJ was named that because….it is based on the 7-30 Waters case. The .444 case was used for appropriate calibers greater than 7mm, smaller ones were usually on the .225 Winchester case., List of rifle cartridges, by primer type, calibre and name. ... .30-06 JDJ.30-06 Springfield.303-06.30-30 Winchester.30-378 Weatherby Magnum.30-40 Krag, When it comes to keeping your Hewlett Packard printer running smoothly, choosing the right ink cartridge is crucial. With so many options available, it can be overwhelming to deter..., Remarks: maximum load; cartridge length: 2.925"; 47,600 psi. 6.5 JDJ / 6.5mm JDJ (Accurate Loading Guide #2) reloading data with 42 loads. Using bullets from Sierra HP, Sierra SP, Hornady SP. Powders include Accurate., 7mm JDJ No. 2. Warning! CAUTION: THESE ARE VERY HOT LOADS! NOTES: Excellent bullets are available for this cartridge. With proper loads and in the hands of a good shot, this chambering is capable of 300-yard shots on smaller big game species. In handgun-length barrels, ballistics are not significantly superior to the smaller 7mm JDJ offerings ..., Jan 24, 2019 · A cartridge I selected is the .309 JDJ, one of the many top-performing wildcat creations by J.D. Jones of SSK Industries, an extremely knowledgeable ballistician, inventor and hunter. , HP Instant Ink is a subscription-based service that provides customers with ink cartridges for their HP printers. The service is designed to save customers time and money by automa..., Handloaders can find .284” bullets (the diameter that all 7mm cartridges digest) as light as 100 grains, perfect for pasture rodents, coyotes, and even deer. Mid-size 7mm cartridges like 7x57 Mauser, 7mm-08 Rem., 284 Win., and 280 Rem. make ideal whitetail and mule deer takers with 140-to 160-grain bullets. Elk, moose, kudu and …, Cartridge Collector > Cartridges > IMPERIAL SPORTING RIFLE ... 358 JDJ. The 358 JDJ was designed by JD Jones of SSK Industries and is based on the 444 Marlin case. , Inkjet printers are ubiquitous nowadays, but not all of them use ink cartridges. HP has developed a new printing technology called Insta Ink that doesn’t require any cartridges. He..., Like numerous other cartridges developed by Jones, the .309 JDJ is proprietary, which means he maintains control over distribution of the company’s chamber reamers. Doing so discourages other people from chambering firearms for his cartridges, and with the exception of the .300 Whisper, the plan seems to have worked fairly well through the …, Best known is his family of cartridges made by necking down the .444 Marlin case and fireforming to a bit less body taper and a 40-degree shoulder. Among those, my favorite is the .309 JDJ (.308-inch bullet), although I also enjoy hunting with SSK barrels chambered for the 8mm, .358 and .375 littermates. , May 6, 2013. #7. Here are two more SSK cartridges I have. 6.5 Mini-Dreadnaught JDJ based on the 220 Swift case and 35-06 JDJ both have 60 degree shoulder and short neck. Pretty sure all of the JDJ cartridges for the Encore have short necks. Never had any issues with them. 257JDJ Contender based on 225 Winchester has a short neck too. Ordered list., SSK is also the home of the Whisper and JDJ series of handgun and rifle cartridges. Once strictly wildcats, Whisper and JDJ ammo can be bought from Cor - Bon ..., This cartridge was innovative and effective, but would become obsolete by the end of the war, and no serious effort was made to continue making Burnside carbines ... “Fat Mac” – SSK Industries’ .950 JDJ Rifle. Related Articles. Aircraft MGs British .303 Browning Mk II* Aircraft Machine Gun October 19, 2021 Ian McCollum ..., a .338 JDJ #1 (marked with #1) that was based off the .303 case. I then sent the barrel to Dennis Lawrence or Brian (been a while) at SSK, who was at the time experimenting with the un yet released, .338 JDJ #2 (off the .444 Marlin case), and rechambered my barrel and had either modified my dies or got another set, to work with it., These large game animals may weigh over 1,000 pounds in some cases. They have large, stout muscle groups and heavy bone structure. Choosing the right cartridge will insure a humane demise and freezer full of meat. Encore Handgun. Mark’s Encore in .375 JDJ with Hornady bullets is his “go-to” big-game-getter., A quick trip to the range resulted in 100 newly fire-formed 6.5 JDJ cases. Dan and Jones both recommend putting the 120 Gr. Nosler BT over 38.0 to 38.5 Gr. of IMR4350. This has been Dan’s go-to load for hunting for many years, and has cost many a game animal its life. Dan has used it for hunting in North America and Africa., Warning! Notes: The .375 JDJ is made by simply running a .444 case through the .375 JDJ full length sizing die. The .375 is exceptionally easy to make. No fireforming is necessary. In loading this cartridge disregard the cannalure. Seat the 220s, 260s, 270s, and 285s with the base of the bullet seated to the end of the neck., JD Jones’ .950 JDJ cartridge is generally described as the largest sporting rifle cartridge ever produced for arguably the strongest gun in the world for sporting purposes. Most Powerful Guns from J. D. Jones. Gunmaker, cartridge designer, and SSK Industries founder J. D. Jones forged a name for himself with quality hunting arms and ..., From the data I have on these 3 cartridges it looks like the 7X30 JDJ (aka 7-30 Waters Improved) will do anything the other two cartridges will do in a Contender but with less powder and less recoil. If you were going to have my barrel rechambered for a 7mm Cartridge which would be your choice and why., About SSK. J.D. Jones, founder of SSK Industries, has been heavily involved with Contenders® since 1969 and has devoted a great deal of his life to the ballistic aspects of sporting, law enforcement, and military cartridges and the firearms that handle them. During the 40’s and early 50’s he supplied numerous individuals with dressed ... , If you are looking for extra “knock down power”, you might consider one of the newest JDJ cartridges – 222 JDJ Magnum. This is a blown out 222 magnum case ..., All of these types of custom rounds belong in a 14" or longer barrel. 1) Starting from a .30 Herrett barrel, rechamber to .30/30 Improved or .30 Alaskan. 2) Starting from a .30/30 barrel, rechamber to .308 Bellm. 3) .309 JDJ and its case capacity do not belong in a Contender barrel, handgun or rifle, in spite of SSK's hype to the contrary, but ...