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338 SPECTRE

      Like the .458 SOCOM, the .338 Spectre cartridge was developed specifically for the AR-15 family of gas-operated, detachable-box magazine-fed firearms. The cartridge is intended to fill the gap between traditional pistol caliber cartridges and...

338 RAZOR

The 338 Razor is another cartridge designed by Alaskan ELR shooter Pro Martusheff (aka Swamplord) from Precision Rifled Ordnance. It is the shorter case version of the 338 Headhunter built specifically for Remington 700 and Winchester Model 70 actions. The case is...

338 HEADHUNTER

The 338 Headhunter is the longer case version of the 338 Razor and was designed by Alaskan ELR shooter Pro Martusheff, owner of Precision Rifled Ordnance who goes by the internet name of Swamplord. The Headhunter was designed as a single shot precision rifle to...

338 EXCALIBUR

   The .338 Excaliber was introduced in 1994 by the A-Square company. The .338 Excaliber is based on a standard (not belted) rimless bottleneck case with the same rim diameter as the .378 Weatherby, but slightly greater powder capacity than the .338 A-Square...

338 EDGE

The .338 Edge was designed by former SWAT/Narcotics officer Shawn Carlock in 2001 and was released after Remington brought out the 300 Remington Ultra Mag, but before the introduction of the 338 Ultra Mag. The 338 Edge is thus effectively a 338/300 RUM wildcat. With...

250 MYRA

The 250 Myra is an Australian design and was originally developed in the late 1950's by Australian gunsmith Arthur Langsford from Melbourne, who named the company after his wife Myra. Like the 243 MYRA it is also based on the 222 Remington case.   

5.7 X 28 P-90

The FN 5.7×28mm is a small-caliber, high-velocity cartridge designed and manufactured by FN Herstal in Belgium. It is a bottlenecked centerfire cartridge that is somewhat similar to the .22 Hornet or .22 K-Hornet. The 5.7×28mm was developed in conjunction with the FN...

33 XC TUBB

The 33 XC (eXtra Capacity) was developed by David Tubb, multiple champion in ELR (Extended Long Range) shooting. It is also the parent case for the 37XC and the 41XC. The idea was to have a cartridge for ELR shooting that had the ballistics of a 338 Lapua Improved,...