"Just for trivia.....30 mauser and 7.63x25 are the same cartridge. The difference is in the power. The old broomhandle was not designed to take the higher power of the x25. Its something similar with the 308 vs 7.62x51."
Huh?
The .30 Mauser didn't become the .30 Mauser until it made it into production in the United States after World War I and the influx of Mauser C96 pistols.
It was originally developed by Hugo Borchardt in the early 1890s. A few years after that Mauser adopted the cartridge, in a beefed up loading, for the C96 pistol.
Standard European ballistics for the C96 variant of the cartridge was 1,400 or so feet per section, about 200 fps faster than Borchardt's original design.
So, the .30 Mauser is simply the Americanized name for the European 7.62x25 cartridge. If anything, American loadings were generally more sedate than the European ones, a problem that Smith & Wesson ran into in the late 1930s when they used American 9mm ammunition to develop the Light Rifle for the British. When the British fired the Light Rifle with European specification ammunition, it broke.