PROOF Case looks like a darkened copper cladding. Might be a PROOF LOAD          ...

Speer

The .300 Remington Ultra Magnum made its debut in 1999, followed by the 7mm Remington Ultra Magnum and in 2002 the .338 & .375 Remington Ultra Magnum were introduced.  The Remington Ultra Magnums, joined an increasingly popular trend toward beltless,...

The 300 PRC was developed by Joe Thielen, who was the assistant director of engineering at Hornady when the 375 Ruger was launched in 2007. It is based on the 375 Ruger necked down with the shoulder moved slightly back and was originally called the 30-375 Ruger. The...

     The 300 Phoenix is a proprietary cartridge developed by G. McMillan & Co. of Phoenix, Arizona, USA, in 1991. This cartridge is based on the 416 Rigby case necked down to 308 caliber.

The 300 Pegasus was developed during 1994 in an attempt to push .30 cal bullets past 3,500 fps. The head is basically the same as for the 378 Weatherby, but without the belt.

     8mm Rem Mag case necked to .30 cal with a 35° shoulder. You can have a look at the website HERE

     In the early 1980s Aubrey White and Noburo Uno of North American Shooting Systems (NASS) based in British Columbia Canada began experimenting with the full length .404 Jeffery by reducing the taper and necking it down to various calibers such...

Designed by the British firm Holland & Holland, the .300 H&H Magnum was introduced in 1925, based on the .375 H&H magnum case necked down to .30 caliber.    Different versions with and without primer crimp         ...

The 300 Ham’r was developed by Bill Wilson from Wilson Tactical to provide a cartridge that could work through a standard AR15 but with the terminal performance of the 30-30 Winchester. The original design for this cartridge was also called the 30-30AR with the case...

The 300 American is dimensionally like the .30 Remington AR that was introduced by Remington and others in 2008. It has the slight rebated rim to fit the AR bolt face. It is not known if the name would have been confusing as there already existed a 30 American, which...

   Based on the 300 Weatherby Magnum

   One of a series of 300 Ackley cartridges with different neck angles

     Picture of the box from IAA Forum

   The 30-40 Krag Improved was developed with the object of attaining approximately 308 Win/30-06 level velocities in small actions like the Marlin Model 97D rifle and T/C Contender.

The .30-.378 Wolfe was designed and developed by Howard Wolfe for long range bench rest shooting, but with the case length shortened to 2.6in.   

     I am still looking for information about this cartridge. The case is still unformed and looks like a 378 Weatherby case. This might be the same as the 30-378 Weatherby.

   This is one of various versions of the 284 Win case that was necked up to .30 cal.

          ANTLERED GAME JOHN WAYNE COMMEMORATIVE OLIVER F. WINCHESTER PROOF WELLS FARGO  

This is one of several versions of a .30cal that was fitted into a 221 Remington Fireball case. It is basically a different version of the 300 Whisper that was invented by JD Jones of SSK industries for an AR-15 type platform. The headstamps shown are by Quality...

   Originally designed by Ralph Waldo Miller in the early 1940’s. His radical design had a single radius transition from shoulder to neck. The first cartridges of his design bore the name of M.V.F. (Miller Venturied Freebore). Later on, he teamed up with E....

HBR (Hunter Bench Rest) class cartridge named for gunsmith Stan Ware, it is basically a 308 Winchester case shortened .165", retaining the 20-degree shoulder angle but with the neck shortened .025" resulting in a C/L of 1.830". It is very similar in appearance to the...