another little tidbit before i forget it. bill poole would probably know more than i. but memory seems to tell me the original swiss round, prior to
the one for the k31, was one of the ones looked at in designing the american service round.
Rubin ammunition was looked at, but in relation to the .30 for the Krag, not the .30/03.
The Ordnance Department sent Frankford Arsenal a box of sample rounds, obtained via the military attache in Paris, on April 29 1890. This included Swiss Rubin rounds, and Frankford was asked to make a batch of ammunition for experimental purposes based on these, for the proposed small calibre smokeless cartridge. They also tried other designs including "headless" (rimless) designs including Belgian Mauser ammunition, before the design which became the .30 Ball service cartridge was adopted in 1893.
Rubin's cartridges were also used in the development of Britain's .303.
