This is a proprietary loading of the 6.5x54 Mannlicher
256 WINCHESTER MAGNUM
The .256 Magnum is a varmint and predator cartridge introduced by Winchester in 1960. In 1961 Ruger brought out the Hawkeye single shot pistol for the .256 Magnum. The next year (1962) Marlin chambered their Model 62 Levermatic rifle for the new Winchester cartridge....
257 ACKLEY IMPROVED
257 APOLLO
Basically a 300 Win Mag necked to .257"
257 BABY-J
- info to follow -
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...
257 DURHAM JET
This is the 25 SOUPER (25-08) Improved, with a 40° shoulder.
257 HAWK
The history of the HAWK range of cartridges can be found HERE
257 HELLBENDER
257 ICL WHITETAIL
ICL = Increased Case Load. This is an improved version of the 257 Roberts
257 ROBERTS
257 SHOOTING TIMES WESTERNER
257 WEATHERBY MAGNUM
26 ALTON JONES
26 BSA
Smallest of 3 in a series developed by the Birmingham Small Arms Company. It was used in bolt-action rifles on the P-14 action.
26 NOSLER
Relatively new cartridge officially launched at the 2014 SHOT show. Full detail HERE
260 AAR
The 260 AAR, or All Around Rifle was originally designed by P.O. Ackley and is essentially a 257 Roberts Ackley Improved that was necked to 6.5mm.
260 HEAVY EXPRESS SHORT ACTION MAGNUM
260 REMINGTON
The .260 was introduced in 1997 by Remington and has achieved a modest following. It is not nearly as successful as the 6,5 Creedmoor, despite being on par and in all probability a better cartridge. The reason maybe for not achieving a bigger following was the fact...
260 WASSER & PICEK
Long range match cartridge designed by Guido Wasser & Ivo Picek around 2000 from a 7.5 x 55 Swiss GP-11 case.
263 EXPRESS
264 HAWK
264 LBC
Les Baer Custom for an AR platform
264 PMS
264 SALISBURY
264 WINCHESTER MAGNUM
264 WINCHESTER PROTOTYPE
This is the prototype for the 264 Win Mag, but without the belt
27 BALL SIMPLEX (PROJECT SALVO)
This round was also developed by Olin Corporation in July 1952 based on the .30 Light Rifle case necked to .27 cal. Specimen has a GM jacket with steel core.
270 – 284 WINCHESTER
Another version of the 284 Win case being necked down, this time to .270 cal.
270 – 378 WEATHERBY
Yet another attempt at a 1000 yd. match cartridge.
270 ACKLEY IMPROVED
270 ACKLEY MAGNUM
270 GIBBS
270 GIPSON MAGNUM
270 HAWK
270 HOWELL
270 ICL JAGUAR
270 IHMSA
Designed by Elgin Gates and based on the 300 Savage case. It is one of the more popular of the IHMSA (International Handgun Metallic Silhouette Association) cartridges.
270 MASHBURN SUPER
One of the Art Mashburn wildcats
270 MW HÖLLER
Cartridge designed by Austrian engineer Franz E. Holler
270 NEWTON
The 270 Newton caliber is most probably not one of Charles Newtons inventions. It would seem that it came along much later than the original 30, 35, 40 and famous 256 (6.5-06) Newton calibers. This case is by Speer, but apparently Western also made it....
270 REDDING
Basically a newer/different version of the 270-08 wildcat from the 1950's but with slight improvement. How slight is probably up for debate. The South African 270 SABI is almost identical to this.
270 SHOOTING TIMES WESTERNER
270 WEATHERBY MAGNUM
270 WINCHESTER
Karlyn Flare Colonial Ammunition Co for the New Zealand Forestry Service The two S&B variations are proof loads SOUTH AFRICAN HEADSTAMPS AND VARIATIONS Red anodized aluminium dummy by THOR Engineering PMP basic brass...
270 WINCHESTER SHORT MAGNUM
270-338 WINCHESTER MAGNUM
275 BLAND MAXIMUM
Based on the 280 ROSS case that was shortened to 2.5" to form a match cartridge during the 1920's
275 FLANGED MAGNUM
This is the rimmed version of the 275 Holland & Holland developed round about 1911-12. Made for double rifles. ...
275 HOFFMAN MAGNUM
The 275 Hoffman is a normal 275 Holland & Holland with a proprietary headstamp.