Below is a replica of the Battlestar that was made by OPM is South Africa     

   300 WSM necked down to 7mm with longer neck for improved accuracy

This is the standard .308 Winchester case that was necked to 7mm. It was adopted by Remington in 1980         

   One of the early Ackley cartridges from around 1950.

The 7mm WSM was introduced by Winchester in 2002 together with the 270 WSM after the release of the 300 WSM in 2001. It is loosely based on the 404 Jeffery case shortened and necked down.

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   The 7mm Valkyrie AR is a wildcat hunting round being developed for the AR-15. It is based on the 6.5x47 Lapua case with the shoulder pushed back to allow it to run in the AR-15 at a 2.295 inch OAL and necked up to 7mm. It is designed around the 140 grain...

The 7mm STW was designed by Layne Simpson during the mid-90’s and was based on the 8mm Remington Magnum case necked down to 7mm. The 7mm STW was adopted by Remington but unfortunately suffered the same fate as the parent 8mm cartridge, being discontinued as a rifle...

     Bob Smith of Smitty's Gun Shop, Lake City MN

Introduced by Remington in 1962 for their famous M700 rifle, the 7mm Rem Mag remains a popular cartridge today.                   SOUTH AFRICAN HEADSTAMPS AND VARIATIONS             ...

   Developed by gunwriter John R. Sundra. Based on the 280 Remington case  

Old wildcat developed by Elgin Gates in the 1970's. It is basically a 30-30 Win necked down to 7mm. Similiar to the 7-30 Waters but with a longer neck.   

Developed in 1987 by Australian Nick Harvey. It is the 6.5mm REM MAG necked up to 7mm with no other changes (http://www.sportingshootermag.com.au/news/shoot-your-own-wildcat)   

This is the rimmed version. There is also a rimless version of this cartridge   

This is the rimless version of the Gradle Express. It was developed during the 1950's by Roy Gradle of Santa Barbara, CA. The original cartridge was based on a heavily modified 348 Winchester case. Except for the rounded shoulder and slightly longer neck, it nearly...

See also 280 REMINGTON under Imperial Sporting Rifle

The 7mm Dakota is one of a line of proprietary magnum hunting cartridges designed by Don Allen and based on the .404 Jeffery case shortened to function in standard (.30-06) length actions.

   Designed by Fred Smith of Bulberry Barrel Works, Hurricane, UT. It is based on the 30-30 Win case shortened and necked to .284" with sharper shoulder and less body taper.  

   "Improved" version of the 7mm Bench Rest

   Designed by Italian Vittorio Gianni. It is based on the 6.5x47 Lapua necked up to 7mm