.256 Newton

Newton's company went bankrupt after the end of World War I and production of commercially loaded ammunition ceased by 1938. 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). 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). 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.

• Name —.256 Newton • Origin — United States • Type — Hunting • Designer — Charles Newton • Design Date — 1913 • Manufacturer — Western Cartridge Company • Is Si Specs — no • Parent —.30-06 Springfield • Case Type — Rimless • Bullet —.264 • Neck —.291 • Shoulder —.418 in (10.6 mm) Shoulder angle: 18° • Base —.471 • Rim Dia —.473 • Rim Thick —.049 • Case Length — 2.440 • Length — 3.40 • Rifling — 1 in • Primer — large rifle • Bw1 — 123 • Vel1 — 3103 • En1 — 2632 • Bw2 — 140 • Vel2 — 3000 • En2 — 2800 • Balsrc — Newton Arms Company Catalog. 14th edition, 1920. IN Barnes, Frank C. "Cartridges of the World" Digest Books Inc., 1972. 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. 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. The.256 Newton suffered from a lack of available slow-burning powders capable of fully exploiting the large capacity of the parent case. Newton's company went bankrupt after the end of World War I and production of commercially loaded ammunition ceased by 1938. 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). 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). 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.