The .256 Newton was a high-velocity, rimless centerfire cartridge based on the .30-06 Springfield military cartridge and developed in 1913 by Charles Newton in conjunction with the Western Cartridge Company.[1] To make the .256 Newton cartridge, the .30-06 case was necked down to a caliber of .264 inches, the overall case length was shortened, body taper was increased, the neck was moved back, and the shoulder was given a sharper, 23-degree angle, as opposed to the 17-degree shoulder of the parent cartridge.[2]
The .256 Newton suffered from a lack of available slow-burning powders capable of fully exploiting the large capacity of the parent case.[2] Newton's company went bankrupt after the end of World War I and production of commercially loaded ammunition ceased by 1938.[2]
After World War II, with a supply of 6.5mm rifles (.264 caliber), the availability of slower burning powders, and inexpensive, surplus .30-06 brass cases, shooters developed the 6.5mm-06 wildcat cartridge by necking down the .30-06 case to 6.5mm (.264 inches).[2] In 1997, the A-Square company standardized the chambering as the 6.5-06 A-Square with the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI).[2][3] Although substantially similar, the .256 Newton is not interchangeable with the .30-06 parent cartridge, the 6.5-06 wildcat chambering, or the SAAMI standardized 6.5-06 A-Square cartridge.[2]
References
- ^ Barnes, Frank, and Amber, John T. Cartridges of the World (DBI, 1972), p.76, ".256 Newton".
- ^ a b c d e f ".256 Newton and 6.5-06". Terminal Ballistics Research. Retrieved 22 March 2018.
- ^ "SAAMI 6_5-06 A-Square" (PDF). Sporting Arms and Ammunition Manufacturers' Institute. SAAMI. Archived from the original (PDF) on 2018-03-22. Retrieved 22 March 2018.
External links
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