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375 JDJ

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The .375 JDJ (J.D. Jones) is a high-powered, wildcat rifle cartridge developed by J.D. Jones of SSK Industries. It is essentially a .444 Marlin case necked down to accept a .375 caliber bullet. Designed for use in single-shot rifles and handguns, particularly the Thompson/Center Contender, the cartridge is favored for its potent performance.
The .375 JDJ is renowned for its versatility and impressive ballistics, making it suitable for both big game hunting and metallic silhouette shooting. It can effectively take down medium to large game, including deer, elk, and even African plains game, thanks to its high muzzle energy and deep penetration characteristics. The cartridge typically fires a bullet weighing between 200 and 300 grains, with muzzle velocities ranging from 2,000 to 2,400 feet per second, depending on the load.
Given its origins as a wildcat cartridge, handloading is a common practice among .375 JDJ users, allowing them to tailor loads for specific purposes and performance characteristics.
Overall, the .375 JDJ is a powerful, versatile cartridge known for its effective performance in both hunting and shooting sports.


Die Sets
Lee Collet Necksizing 2-Die Set
Lee RGB Die Set
Lee Full-Length Sizing Die Set
Lee Breech Lock Die Set
Lee Ultimate 4-Die Set
Lee Loader
Single Dies
Full-Length Sizing Die
Sizing Die
Neck Sizing Die
Undersize Sizing Die
Charging Die
Seating Die
Factory Crimp Die
Taper Crimp Die
Inline Bullet Feed Die
Case Conditioning Tools
Case Length Gauge and Shell Holder
90493
Quick Trim Die
Presses
Reloader Press (50 RPH)
Hand Press (50 RPH)
Challenger Press (50 RPH)
Classic Cast Press (50 RPH)
Value Turret Press (250 RPH)
Classic Turret Press (250 RPH)
Ultimate Turret Press (250 RPH)
Pro 1000 Press (500+ RPH)
Pro 4000 Press (500+ RPH)
Six Pack Pro Press (500+ RPH)
Shell Plates and Holders
Priming Tool Shell Holder
90211 (#11)
Universal Press Shell Holder
90528 (R11)
X-Press Shell Holder (APP)
91544 (#11)
Pro 1000 Shell Plate
Auto Breech | Pro 4000 Shell Plate
90648 (11)
Six Pack Pro Shell Plate
91846 (11L)
Inline Bullet Feed
Inline Bullet Feed Die
Inline Bullet Feed Kit
Inline Bullet Feed Magazine
Bullet Casting
Classic Bullet Sizing Kit
Breech Lock Bullet Sizer and Punch
Bullet Molds

Micrometer Adjust Screw

From $20.00

Power Grip Shell Holder

92149
$10.00

Challenger III

From $117.00

Ultimate Turret Press

From $320.00

Deluxe APP Press Kit

91898

Includes:

  • Press
  • Roller Handle
  • Priming System
  • Universal Case Feeder
  • APP Deprime Kit
  • Bottle Adapter
$155.00

Six Pack Pro Press

From $400.00