The .30 Newton cartridge was designed by Charles Newton in 1913, based on a German caliber of the period, the 11.2x72 Schuler. 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.https://ammo.com/articles/charles-newton-wildcatter-created-22-savage-250-savage-forgotten-history 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 The Western Cartridge Company was an American manufacturer of small arms and ammunition formerly based in East Alton, Illinois. Founded in 1898, it was the forerunner of the Olin Corporation, formed in 1944, of which Western was absorbed into. ...

. Small runs of 30 Newton brass are occasionally made by Jamison Brass.http://www.thegunmag.com/jamison-brass-back-in-business-making-brass-and-loaded-ammo/ 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.

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