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   

Part of a series of large caliber rifles by Gil van Horn.   

   GERALD QUINTEL

   An interesting .700” cartridge to come out of an old Denel collection.  The cartridge is fabricated on a 12.7mm BMG case.  The primer pocket has been modified to accept a 5.7mm primer. Bullet Ø17.75mm (.700”), Rim Ø20.35-20.45mm, Belt Ø 20.25mm,...

The 700 JDJ was designed by JD Jones from SSK Industries around 1995 and used a 50 cal. case that was shortened and necked to .700 cal.   

The 700 Jaguar Subsonic was made by Jaguar in all probability prior to 2009 for a GPR (German Precision Rifles) prototype rifle with interchangeable barrels in .50 Cal. (12.7x99), 10.2x94 Jaguar, and .700 Jaguar Subsonic. The design is based on the .50 Cal. Browning...

   Designed by Ed Hubel and based on the 50 BMG case.

   Shorter version of the 700 Hubel Express designed by Ed Hubel and based on the 50 BMG case.

The .700 AHR was designed by Ed Plummer and Wayne Jacobson of American Hunting Rifles, Inc during the late 1990s   

- info to follow -   

   Based on a modified 50cal. case and designed by Hungarian gunsmith, Joseph Szecsei for a bolt action DOUBLE RIFLE.

   GERALD QUINTEL

   The 600 Overkill was designed by Robert Garnick of Las Vegas, Nevada. The case is his own original design; it was not re-worked from a 600 Nitro Express or any other case.

The 585 Nyati was developed by US gun writer Ross Seyfried in 1990 to provide hunters at the time with a more cost effective, high powered alternative to the expensive double rifles available. Nyati means buffalo in various African dialects. The 585 Nyati is based on...

     Designed by Ed Hubel and uses a 50cal. as base.

   Uses the 505 Gibbs case as a base and cut to 2.7"

From the early 90's. The case is based on long .585 Nyati/585 GMA Basic brass cases, with a belt added for headspacing and rim set to fit the .505 Gibbs bolt face.