There is someone on EBay selling a blued COntender barrel in 7JDJ2, has anyone heard of it? I sent the guy an email and he told me that it is a wildcat cartridge.... Duh, but it was not a typo. The ad says it comes with dies and .307 brass that needs to formed...
I sent another email to ask what the box said on the dies and what caliber is printed on the barrel... I looked in my reloading books, but I don't see it listed anywhere?????

JD made some different variations. Some were based on the 225 Winchester case and others were on the 307 Case. It is a cartridge designation used by SSK.

Yes SSK actually has three different 7mm Cartridges with the JDJ name on them. One (the original) 7mm JDJ was based on the .225 Winchester Case. The 7mm JDJ #2 is based on the .307 Winchester Case and is basically a Rimmed 7mm-08 Improved. The last is the 7-30 JDJ which is SSK's version of an Improved 7-30 Waters from what I have been told.

Just this past Monday I obtained Loading Data for the 7mm JDJ #2 from SSK Industries. If you send them $1.00 for the data and $1.00 shipping and handling they will send out the data. From the data SSK provided me with it looks as though the very top load with a 139-140gr. Bullet will approach 2400 FPS.

I had been considering this cartridge thus the reason for obtaining the info from SSK.

Larry