The Heavy Express range of cartridges was developed by Jim Busha, from Colorado Springs CO, and was based on the 348 Winchester case with the rim removed. They came in a variety of calibers, ranging from .240 to .500 caliber and in 2 different versions, namely the...

The Heavy Express range of cartridges was developed by Jim Busha, from Colorado Springs CO, and was based on the 348 Winchester case with the rim removed. They came in a variety of calibers, ranging from .240 to .500 caliber and in 2 different versions, namely the...

The .375 Hawk/Scovill was designed by Bob Fulton and Dave Scovill and it is basically a .30-06 necked up to .375 inch with the Brown-Whelen shoulder configuration, meaning the shoulder is sharpened slightly and moved further forward, as opposed to the Ackley version...

This is one of the various improved versions of the 375 Flanged Magnum   

This is one of a number of versions of the 458 Win Mag case necked down to .375 or alternatively the 338 Win Mag case necked up to .375. See also 375/338 Win Mag.   

The following is from P.O. Ackley's "Handbook for Shooters and Reloaders", Volume One: "The .375 Durham Magnum is the .338 Win Mag case necked up to .375 with a 35 degree shoulder angle to provide a very fine short .375 Mag cartridge with an overall length suitable...

Developed by Don Allen, owner of Dakota Arms in Sturgis, SD and was developed as an alternative to the 375 Holland & Holland but a rimless, shortened case that is based on the 404 Jeffery case, so as to fit in a standard length action. This is almost the same idea...

The 375 Canadian Magnum was developed by Aubrey White and Noburo Uno and is based on the .404 Jeffery cartridge but with a slightly rebated rim.   

   Based on the 404 Jeffery case to make a good .375cal cartridge on a shorter action.

The 375 Black Mesa Express was launched in 1993 by Ronald Brian McDaniels in Kenton, Oklahoma, who originally founded the Black Mesa Rifle Co. in 1992. It was named after Black Mesa, the highest point in Oklahoma.    Black Mesa range, OK

This is another “improved” version of the 375 H&H Magnum  

The 375 A-Square is based on a 378 Weatherby case slightly shortened and the shoulder moved slightly forward and with a 35° shoulder as opposed to the double radius of the 378 WBY. It was developed around 1975 by the A-Square Company and attempted to duplicate 378...

   This cartridge dates from around 2007 and is based on the 404 Jeffery case necked to .375. It was developed by Saeed al-Maktoum of Dubai.

   This is one of a variety of improved (Ackley) designs based on the 375 H&H case, this version having a 40° shoulder.

Another design similar to the 375 Viersco Magnum for long to ultra-long range shooting to push a 375 bullet above 3,000 fps.   

This is another joint development between Sako and Federal that started with the introduction of the 338 Federal. The 370 Sako is the American version of the 9.3x66 SAKO that is a relatively popular cartridge in Europe. It is balistically between the 338 Win Mag and...

The 37 XC (eXtra Capacity) was developed by David Tubb and is the standard 33 XC necked up to .375. The cases at this stage are not properly headstamped and uses the 33 XC case.    

The 366 DGW was conceived by David G Walker and is based on the 416 Rigby case necked to .366” (9.3mm) and was developed around 2000 by Judson Bailey from The Workshop in St. Albans, ME. It was developed as a hard hitting medium caliber rifle that will still shoot as...

The Imperial Magnums .300, .311, .338, .360 and 7mm were introduced circa 1991 by the Imperial Magnum Corporation, Osayoos, British Columbia, Canada after buying the IMPERIAL trademark from Canadian Industries Limited and later IVI (Industries Valcartier Inc.) when...

under construction

The 358 Yukon is based on the 300 Remington Ultra Magnum case shortened to 2.56" and was designed to function in standard length bolt actions.   

Two years before the adoption of the 7.62 NATO in 1954 Winchester had already applied for and received the rights to market the new round commercially as the 308 Winchester which turned out to be one of Winchester’s success stories, Shortly afterwards in 1953 they...

The 358 STA dates from 1992 and was designed by gun writer Layne Simpson and is based on the 8mm Remington Magnum necked up to .358cal. but less body taper than the 8mm Rem Mag cartridge as well as a sharper 35° shoulder.

under construction

The 358 JDJ was designed by JD Jones of SSK Industries and is based on the 444 Marlin case.      

This is effectively a shortened 358 Winchester in order to comply with Indiana hunting regulation that limit the length of the cartridge to 1.800"   

The 358 Hawk is one of a series of 11 cartridges designed by Bob Fulton and Fred Zeglin during the late 80’s. The .358 is based on the 30-06 case necked up to .358 in.   

One of two cartridge designs (the other being the 375 Enterkin) and was the brainchild of the late Col. Lawrence Gene Enterkin during the late 1960’s who used to own the Powder Horn gun shop in Cusetta GA. The 358 Enterkin is based on the 300 Weatherby case necked up...

   Based on the 444 Marlin case, the 358 Bellm was developed by Don Shearer, Littleton, CO. and mainly for use in T/C Contenders.

 - info to follow -   

This is the same as the rest of the Barnes Supreme series with a full length magnum case, minimum taper and a sharper shoulder.   

Old wildcat dating from the mid 60’s and is based on the 300 Win Mag necked up to .358 cal. and is also known as the 358/300 Win Mag. From the Firearms Forum it states that the .358 Apollo is stamped 358/300 HARP with the rifles made by Harrison Taylor Harp from...

The 356 Winchester was introduced in 1982 for their Model 94 XTR lever action rifle and is basically a rimmed version of the 358 Winchester that Winchester launched in 1955. It never gained any loyal following and Winchester ceased production of the M94 XTR altogether...

This was a French loading during WW1

Designed and launched by Winchester in 2019, the 350 Legend was developed for deer and hog hunting. From Guns & Ammo Magazine: In June 2014, Michigan’s Natural Resources Commission (NRC) approved the regulation to allow the limited use of certain rifles capable of...

     PROVIDENCE. TOOL CO. - ON AN EVERLASTING CASE   I'm not sure about these 2 specimens. I anyone has any info on this please let me know    

   This is the 284 Win case necked up to .35. It gives basically the same ballistics as the 35 Whelen with about the same case capacity.

The 35 Whelen was introduced by Whelen on September 15th, 1923 in the American Rifleman in an article titled American Heavy Caliber Rifles for Large Game. Whelen reported that they were getting 2834 fps with a 200 grain bullet and 2635 fps with a 250 grain one....