Developed by American gun maker John Buhmiller. Still looking for additional info.  

The 420 Blitzkrieg dates from around mid-2017 and was designed by Alaskan Long Range Shooters Pro Martusheff (aka Swamplord) and Mark Fox from Precision Rifled Ordnance. Their design is based on a new case design and is not based off any existing case. Cases are made...

Still trying to get some info on this. There was an article on Jeff Reed winning the USA 2000-yard Elite Long Range National in Townsend Montana with a grouping of 13.059" which was a new ELR record.    

This cartridge was developed by JD Jones that actually started out as the 411 Whammy. Reason being that at that stage there were a good variety of .411 cal bullets available in the US as opposed t the 416. With the resurgence of the 416 Rigby, quality bullets became...

   This is the 375 Remington Ultra Mag necked up to .416. There are different versions of this, but this is the version by Fred Zeglin of Z-Hat.

This cartridge was created in the early 1970’s by Robert Chatfield-Taylor as an standard length alternative to the 416 Rigby which was all but obsolete at that stage. It is basically a 458 Win Mag case necked down to .416.  

   This is the 404 Jeffery case necked to 416.

Launched in 1989 and based on the 8mm REM MAG necked up, it was designed to be a more cost effective alternative to the 416 Rigby. Instead of replacing the 416 Rigby it actually lead to a resurgence in interest in the .416 cal rifles.

   Based on the Remington Ultra Mag case, that was shortened and necked up to .416 for standard length actions

   The 416 JDJ was developed by SSK Industries and is based on the 444 Marlin case. It is one of the cartridges that SSK uses in the Thompson Contender.

The .416 Hushpuppy is a proprietary cartridge offered with a AR upper by AM-TAC Precision and was announced at the 2014 SHOT show. The 416 Hushpuppy is claimed to have a maximum point blank range to 200yds on a man sized targets and creates a wound channel larger than...

   The 416 Howell is a shortened 404 Jeffery case, necked to 416 and with a little more shoulder. Powder capacity runs around 80 to 85 grains with a 400 grain bullet, and performance is a tad above the 416 Remington.

     Made for Butch Searcy, a US gun writer for a Ruger No.1 rifle

   Based on the 300 Winchester Short Magnum case and developed by Daryl Lenkic. The idea was to have a short action magnum type cartridge with enough stopping power for African game. This cartridge is almost identical to the 416 WSM cartridge.

     There is not a lot of info about this cartridge and nothing is mentioned on the WEBSITE, other than seriously good looking guns.      

The 416 Barnes was the last cartridge designed during the late 1980’s by the late Frank Barnes. All the 416 calibers at the time of this design were for African hunting conditions and he felt that there would be a need for a .416 cal. adapted for the American hunter....

     The B&M rifle series was conceived in 2005 by William V. Bruton (The B) and Michael McCourry (The M). You can check out the website HERE

Experimental cartridge developed by Winchester in 1956. Apparently the bullets were hand made by Winchester.   

     Developed in the 1980's by KDF Inc. (Kleinguenther's Distinctive Firearms), a US based company in Seguin TX. They specialise in high end German guns. The 411 KDF is effectively a 338 Win Mag necked up.

   Based on the 404 Jeffery case. Still looking for more info  

     I got this cartridge from JD Jones during his visit to South Africa 1991

   Created by Fred Ziegler of Z-HAT Custom around 2002, this is the longest version of the 30-06 that will function through a standard length action.

- looking for info -   

Developed by Winchester in the 1960’s and registered with SAAMI on 7/1/1965. It utilized a 200 grain jacketed soft point projectile. Was developed for the M1894 Winchester action to enhance the performance of available cartridges. The cartridge was...

Made by the late Ken Stewart for an American client. Based on the 338 Win Mag case necked to .40 cal.   

     Still looking for info on this cartridge

     Most probably some German design, however I have not been able to get any additional info on this one.

The Dakota cartridges were designed by the Late Don Allen (1941- 2003). His designs were based on the formed brass he purchased from Noburo Uno. Noburo Uno and Aubrey White of North American Shooting Systems (NASS), based in British Columbia Canada, began...

ART = Directorate of Artillery, W = Winchester, ECP = Ecole Centrale de Pyrotechnie, Bourges. January 1916    Maurice Megret (France)  

   Old wildcat based on the 458 WIN MAG case necked down

The 400 Warlord were designed by Alaskan ELR shooter Pro Martusheff (aka Swamplord) in 2018. More info here.