The 500 Mbogo was developed by Ronald A. Berry M.D. Ron has developed about 2 dozen different wildcats, but only two have been loaded as proprietary loadings, namely this one and the 395 Tatanka.     

Replica cartridge and based on a shortened 50-70 case   

- info to follow -   

The 500 Cyrus was developed by wildcatter Michael Cyrus of Cross Outdoors, Prichard, WV. The idea was to provide a big-bore rifle with a shortened action of less than 3 inches that would be capapble of giving 470 Nitro type stopping power, as well as to take advantage...

                   The 500 Auto Max was developed by Big Horn Armory in Cody, WY as a rimless version of the 500 S&W Magnum and was designed for an AR-500 platform. Big Horn...

The A-Square series of cartridges was designed in 1974 by Col. Arthur Alphin after a hunting incident with Cape buffalo using the .458 Winchester Magnum. He first designed the .500 A-Square to provide maximum stopping power. In order to gain more powder capacity and...

The 500 Accurate Reloading was developed by Jeff 'Jeffeosso' Smith of http://accuratereloading.com/. This is a shortened and improved .416 Rigby, necked to .510"       

   The 50 Thumper was the first of a new line of cartridges by Subsonic Hunter in Winter Park, Florida designed for hog hunting.

Developed by Skip Talbot and based on a .50 Spotter case. It is not mentioned if this was the cartridge that Skip used to set a new World record at 1,000 yards with a 2,600” grouping.   ...

The 50 TAC was developed in response to customer requests for a version of the 500 Cyrus that would accept .510” diameter bullets usually intended for the 50 BMG     

The 50 Razorback was developed by Delta Company Arms and is based on the 300 Remington Ultra Mag case that was cut back to 2.375 inches and loaded with a .510 cal. bullet.    

   Many 50-caliber competitors consider the case volume of the original BMG cartridge to be more than adequate for 1000 yard shooting and they seek improvements in the form of more precision rather than added velocity. Taking a page from the small caliber...

- info to follow -   

 - info to follow -   

Developed by Silas Crispin, a U.S. Army Ordnance officer in the period 1865 to early 1870's. You can find more info HERE

     Based on the Remington Ultra Mag case cut to 2¼"

     This is the shortened version of the standard 50 B&M. You will find more info HERE  

The 50 Allan Tactical was developed by Kirby Allen from Allen Precision Shooting in Fort Shaw, Montana. It is based on the 408 Cheyenne Tactical case.    

     The .50 Alaskan dates back to the 1950′s when Harold Johnson,a gunsmith in Cooper Landing, Alaska, necked up and straightened out the .348 Winchester case to .50 caliber.

     This was an experimental cartridge from Winchester and was never marketed. Most specimens are board dummies.

VF = VAL FORGETT, OWNER OF NAVY ARMS TEXAS CARTRIDGE COLLECTORS ASSOCIATION THE GUNSMITH (FRANK MILLS), BEDFORD VA.

     BOARD DUMMY with hollow point copper tube bullet with raised 'X'. This was an experimental cartridge that was based on the 50–110 Winchester case.  

Winchester introduced the .50-100 Winchester (.50-100-450) cartridge uring the early 1890's, which was a close cousin to the .50-110 Winchester. This load fired a 450gr bullet at approximately 1,455fps (2,190 foot pounds of energy). The .50-110 and .50-100 Winchester...

   SHOT LOAD  

     Relatively rare SHARPS cartridge. Was not in use for very long. (Hoyem 4 p.29)

     Whisper cartridge based on the 50-70 Government case