Relatively new cartridge officially launched at the 2014 SHOT show. Full detail HERE
375 TAYLOR
For all practical purposes the same as the 375/338 Win Mag, being a 338 Win Mag case necked up to .375 or a 458 Win Mag case necked down to .375. See also 375/338 Win Mag
228-250 DONALDSON
375 STRIEBY
Developed by Ronald Strieby and based on the popular 348 Winchester case necked up.
26 ALTON JONES
375 SNIPE-TAC
The 375 Snipe Tac is an improved 408 Chey-Tac case necked down to .375cal and shoulder blown out to 35° and pushed forward about .050 inch 375 Snipe Tac by Black Diamond Rifles
228 R&M HAWK
375 RUGER
Developed in a joint venture between Ruger and Hornady, the .375 Ruger was first introduced 2007. The idea was to create a cartridge similar in length to the .30-06 Springfield, but with a case capacity comparable to the .375 Holland & Holland. A major selling...
257 WEATHERBY MAGNUM
375 REMINGTON ULTRA MAG
Remington introduced the .375 Remington Ultra Mag in the fall of 2000 by simply necking up its popular .300 Ultra Mag case — a case that is based on the beltless .404 Jeffery with a slightly rebated rim.
228 ACKLEY MAGNUM
The original version of the 228 Ackley Magnum was developed by P.O. Ackley in 1938, although the idea came from around 1936 and was one of his first wildcat designs. He was looking for a better version high velocity .22 cal. rifle and his design is based...
375 MERCENARY
This is another design by Alaskan ELR shooter Pro Martusheff (aka Swamplord) from Precisioned Rifle Ordnance and dates from 2013 but was officially launched in August 2014. The original cases were made by Bertrams Australia, but current production is by RCC Brass in...
375 LETHAL MAGNUM
The 375 Lethal Magnum was developed by Lethal Precision Arms to achieve extremely high ballistic performance in a portable package for long range shooting. By using an custom built LPA rifle, LPA owner Mitch Fitzpatrick took 1st place during the 2016 King of 2 Miles...
257 SHOOTING TIMES WESTERNER
375 KNOCKOUT
The 375 KO is, as its name suggest, a true knockout blow. It's ballistics are superior to any other suppressed round for the AR-15/MSR platform. It leaves the muzzle with 1050 fps and 857 fpe. While the 857 fpe is remarkable enough for a subsonic as it is...
225 WINCHESTER
375 JURRAS
One of a series of cartridges designed by the Late Lee Jurras, one of the greats in handgun hunting. He was very interested in the exploits of the old hunters with their Howdah pistols and in the early 1970’s brought out his own versions chambered in 6 different...
257 ROBERTS
375 JRS
The 375 JRS was developed by John R. Sundra, who necked an 8mm Remington Magnum to 375 caliber. Its performance is almost identical to the 375 Weatherby.
224 WEATHERBY MAGNUM
375 JENSEN
The 375 Jensen is based on the 30-06 case necked up to .375 cal. and was developed by Stig Anders Jensen, owner of The Jensen Rifle Company Ltd., a Division of Baltimar Ltd. (Denmark) around May 2004.
224 VALKYRIE
This is a new development by Federal that was introduced in December 2017 as a definitive cartridge for the AR based platform. The 22 Nosler provided about a 25% improvement in velocity and 30% in energy over the existing 5.56 NATO round when it was introduced in...
257 ICL WHITETAIL
ICL = Increased Case Load. This is an improved version of the 257 Roberts
375 JDJ
The 375 JDJ was designed and developed by J.D. Jones, from SSK Industries as part of a series of handgun and metallic silhouette cartridges around 1978. The purpose of these cartridges was to give added range and power to the Thompson - Center Contender pistol for...
224 TEXAS TROPHY HUNTER
The 224 TTH was introduced by the Texas Trophy Hunters Association in 2000, but it was taken from an old idea...
375 ICL KODIAK
The 375 ICL (Increased Case Load) was developed by Arnold & Vern Juenke, gunsmiths who owned Saturn Gun Works in Reno, Nevada and is based on the 375 Holland & Holland case. It resembles the earlier Ackley Improved version, but with slightly lower and slightly...
257 HELLBENDER
375 HOLLAND & HOLLAND MAGNUM IMPROVED
One of a few ‘improved’ versions of the old 375 Holland & Holland case.
257 HAWK
The history of the HAWK range of cartridges can be found HERE
375 HOFFMAN MAGNUM
Display Dummy Although listed separately, this is a normal 375 HOLLAND & HOLLAND but with the proprietary Hoffman headstamp. Hoffman Arms, in most cases, called the calibers by their (Hoffman's) own name but the only proprietary cartridges they actually had were...
224 REMINGTON EXPERIMENTAL
375 HEAVY EXPRESS SHORT ACTION MAGNUM
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...
375 HEAVY EXPRESS MAGNUM
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...
257 DURHAM JET
This is the 25 SOUPER (25-08) Improved, with a 40° shoulder.
375 HAWK-SCOVILL
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...
224 McDONALD
Resembles the 22 Dasher, but with a longer body and shorter neck. The goal of this exercise is to get as much speed as possible from the case/bullet.
375 FLANGED MAGNUM IMPROVED
This is one of the various improved versions of the 375 Flanged Magnum
375 EPSTEIN
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.
224 KAY CHUCK JUNIOR
info to follow
224 KAY CHUCK
Based on the 22 Hornet case. The first specimen below is with the original Sisk 50gr. bullet
375 DURHAM MAGNUM
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...
257 CONDOR
This is the original story about the 257 Condor taken from GUNS MAGAZINE, Jan 1960 When a competent engineer decides to design a wildcat cartridge, some old ideas are given some new twists. The usual wildcatter reshapes an existing case, uses existing...
375 DAKOTA
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...
223 WINCHESTER SUPER SHORT MAGNUM
Announced in 2002, the Winchester Super Short Magnum cartridges are intended to deliver a new level of long-range performance and accuracy to the .223 & .243 family of chamberings. Cartridge overall length is 2.36”, a half-inch shorter than the 2.80”...
375 CANADIAN MAGNUM
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.
257 BABY-J
- info to follow -
257 APOLLO
Basically a 300 Win Mag necked to .257"
375 BREEDING
Based on the 404 Jeffery case to make a good .375cal cartridge on a shorter action.
223 SHORT
Relatively new wildcat
375 BLACK MESA EXPRESS
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