The 7mm JDJ is a SSK Industries wildcat cartridge for the TC Contender, based on the .225 Winchester case necked up to 7mm. It delivers good energy for a handgun cartridge with excellent bullet selection.
Type: Pistol
Introduced: 1978, USA
Parent case: .225 Winchester
Standardization: Proprietary
Bullet diameter: 0.284" (7.21 mm)
Case length: 1.395" (35.43 mm)
Overall length: 1.775" (45.09 mm)
Rim type: Rimless
Primer: Large Pistol
Muzzle velocity: 1600–1950 fps
Muzzle energy: 682–1300 ft-lbs
Effective range: 100 yd
Common bullet weights: 120, 140, 154 gr
Primary use: hunting, handgun_hunting
Production status: Active
Also known as: 7 JDJ · 7mm SSK JDJ
History: Part of J.D. Jones' original JDJ family designed in the late 1970s, the 7mm JDJ offers similar performance to 7-30 Waters but in a slightly different case design. It is typically ordered as a custom barrel from SSK Industries.
Notable firearms: Thompson/Center Contender, TC Encore
Similar cartridges: 6.5 JDJ, .309 JDJ, 7-30 Waters