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|Place of origin||United States|
|Parent case||11.2x72 Schuler|
|Bullet diameter||.308 in (7.8 mm)|
|Neck diameter||.340 in (8.6 mm)|
|Shoulder diameter||.491 in (12.5 mm)|
|Base diameter||.523 in (13.3 mm)|
|Rim diameter||.525 in (13.3 mm)|
|Case length||2.52 in (64 mm)|
|Overall length||3.35 in (85 mm)|
|Case capacity||89.0 gr. water|
|Rifling twist||10 to 12|
|Primer type||large rifle|
|Source(s): Newton Arms Company Catalog. 14th Edition: 1920. IN "Cartridges of the World" Frank C. Barnes, 3rd Edition: 1972.|
Newton originally called the cartridge the 30 Adolph Express after Fred Adolph, a well known immigrant gunsmith from Germany at the time, who had proposed the idea of necking rimless German cartridges down to produce a high velocity hunting cartridge. During Newton's period of cartridge and rifle design, the only rimless American cartridge was the smaller 30/06. When Newton later began manufacturing and marketing the ammunition for his cartridges and line of rifles, he renamed it the 30 Newton.
The Newton Arms Company was the only manufacturer of commercial rifles chambered for this cartridge. It should not be confused with the .30 Belted Newton (a.k.a. .30-338), which is a different cartridge not designed by Charles Newton. Although suitable for any large North American game, it is an obsolete round no longer manufactured. Before World War II, loaded cartridges were once offered by Western Cartridge Company. Small runs of 30 Newton brass are occasionally made by Jamison Brass and Roberson Brass. Cases for 30 Newton can be easily made from .375 Ruger as they are very similar other than the caliber of the case neck; so much so that many assume Ruger based their cartridge on the 30 Newton case. 8x68S brass can also be used.
- Barnes, Frank C. Cartridges of the World. 3rd Edition: 1972.
- Charles Newton: Father of High Velocity. Jennings. 1985. ASIN B00147N8N4.
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