I never said that the 9.3 Mauser was not born from the 7 and 8 Mauser, what i said was that I agreed JoeBob in that it was a separate development. What I meant by that is Otto Bock's 9.3x62 case isn't a exactly a lengthened 8x57 case with a larger bore. The 8x57 has a base diameter of .470" and the 9.3x62 has a base diameter of .476". This is similar to William Brennke's 7x64, technically it's not a 7mm longer 7x57 because the base diameter is .467 vs the .470 for the 7x57. In the same vein, the 6.5x55 is a separate development because of it's 0.480 base diameter. I will agree that this is also nuanced minutiae.
What I know of the 30-01 is that it was an experimental cartridge with a case length of 2.554"~2.564" developed for testing but not actually adopted. Frankfort Arsenal loaded up 10,000 rounds for development and in 1903 it was shortened to 2.54" and adopted as the 30-03. As you said "nuanced minutiae".
