This was part of the development of the 223 Remington. Because of concerns over chamber pressures, Armalite redesigned the 222 Remington case to increase powder space, while keeping the OAL relatively unchanged. In order to avoid confusion with the 222 Remington and...
222 SUPER RIMMED
The .222 Rimmed was developed using the original .222 Remington case as a basis to provide a suitable cartridge alternative for the huge number of surplus .310 Martini Cadet rifles available in Australia in the 1950s. The Super Cartridge Co (Maribyrnong, Melbourne,...
223 ACKLEY IMPROVED
Based on the 223 Remington case with a 40° shouder
223 PPC
One of the predecessors to the 22 PPC, this one being based on the 223 Remington case, with a longer shoulder and steeper neck
223 SCORPION
Based on the .30M1 case and resembles a 5.7mm MMJ, but with a more gentle shoulder. According to Dan Watters on THE GUN ZONE, the 223 Scorpion was the brainchild of Californian gunsmith Ken Bucklin way back in 1945. The above specimen is a recent remake...
223 SHORT
Relatively new wildcat
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”...
224 KAY CHUCK
Based on the 22 Hornet case. The first specimen below is with the original Sisk 50gr. bullet
224 KAY CHUCK JUNIOR
info to follow
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.
224 REMINGTON EXPERIMENTAL
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...
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...
224 WEATHERBY MAGNUM
224 WINCHESTER E2 BALL
This cartridge was developed from the 224 Winchester Experimental Ball to correct the pressure problems encountered during testing. It has a longer neck and utilised a lighter bullet. ...
224 WINCHESTER E4 XPL
The 224 Winchester E4 was an experimental cartridge and may have been based on the 25 Winchester case. There is no record of any rifle for this cartridge and it might have been used in a special test barrel.
224 WINCHESTER E5 XPL
This was the final design in the series and was called the Cal. 224 Winchester E5 and dates from 1963. This was a bottlenecked case with a reduced rim.
224 WINCHESTER EXPERIMENTAL BALL
This is a prototype cartridge by Winchester in 1957 for the development of a .224 caliber cartridge for a light military rifle. Some of the early loads had to be removed because of high chamber pressures.
225 WINCHESTER
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...
228 MIRAGE
Listed in the ECRA database as one of the MYRA developments.
228 R&M HAWK
228 WEATHERBY MAGNUM
The 228 Weatherby was never commercially manufactured and information about this cartridge is scarce. On the Weatherby.dk forum it is stated that the 228 was Roy Weatherby’s second development after the 220 Rocket and it was based on a shortened and necked 275 H&H...
228-250 DONALDSON
236 REMINGTON
236 USN RIMMED
24 NOSLER
The 24 Nosler was designed by Mike Lake, who is the Senior Manager of Engineering and R&D at Nosler. He was also responsible for the development of the 26 Nosler (2013), 28 Nosler (2015), 30 Nosler (2016), and the 33 Nosler (2017), all of which are based on the...
240 BELTED RIMLESS NITRO (APEX)
Vey early loading Proof Load with purple base stripe. Bullet is a wire tip. Different versions with HOLLAND headstamp. Note the first specimen with the prominent primer ring crimp. ...
240 FLANGED MAGNUM
The 240 Flanged is the rimmed counterpart of the 240 Rimless and dates from the early 1920's new by OPM for local client
240 GIBBS
240 HAWK
The HAWK line of cartridges were developed around 1988 by Bob Fulton. The 240 Hawk is basically a 6mm-280 Remington Improved
240 HEAVY EXPRESS SHORT ACTION MAGNUM
- info to follow -
240 NMC (NATIONAL MATCH COURSE)
Match cartridge based on the 243 Winchester case with improved 30° shoulder
240 TOMAHAWK
240 WEATHERBY MAGNUM
240/375 MATCH
This is an early experimental British loading made by necking down the 375/303 case to .240.
242 RIMLESS NITRO EXPRESS (VICKERS)
Developed around 1923 reportedly for Manton & Co., Calcutta, India by Kynoch.
243 ACKLEY IMPROVED
243 CATBIRD
The .243 Catbird was designed as an ultra-long range 6mm varmint round. It is based on the .270 Winchester case necked down to .243 and blown out with a 35 degree shoulder.
243 MYRA
The 243 Myra is an Australian design and was originally developed in 1958 by Australian gunsmith Arthur Langsford from Melbourne, who named the company after his wife Myra. It is based on the 222 Remington case necked up to 6mm.
243 MYRA RIMMED
This is the rimmed version of the Australian designed 243 Myra that was originally developed by Australian gunsmith Arthur Langsford from, who named the company after his wife Myra. It was based on the 222 Remington Rimmed, another Australian development,...
243 RCBS
"Improved" version (shoulder angle increased from 20° to 26.7°) of the 243 Winchester and about halfway between the ordinary 243 Win and the 243 Ackley
243 ROCKCHUCKER
257 Roberts necked down to 6mm/.243 cal (which is basically what the 6mm Remington is), however the 243 RC predates the 6mm Remington and the only difference is on the shoulder angle. Most shooters prefer the 6mm Remington because of the availability of...
243 WINCHESTER
PROOF Super (Australia) SOUTH AFRICAN HEADSTAMPS AND VARIATIONS BOSS PRO-AMM
243 WINCHESTER SUPER SHORT MAGNUM
244 HALGER MAGNUM
This is the prototype version
244 HALGER RIMMED
244 HOLLAND & HOLLAND MAGNUM
Introduced in 1955, this was the last belted magnum case by Holland & Holland Modern load by Wolfgang Romey, Germany Laboratory for Ballistics, Germany This case was done by OPM in South Africa. It is an untrimmed 458 Win basic brass case and overstamped...
244 MASHBURN
The 244 Mashburn is an improved version of the 6mm Remington with a shoulder angle of 30° and minimum body taper
244 REMINGTON (6mm REMINGTON)
See notes on the 6mm Remington