Well, with patriotism aside, national pride, brand loyalty aside for a moment, let's look at the following compelling circumstantial evidence, which is at least enough to leave the matter open to speculation:
A 6.7 Neuber will chamber and fire a 270 win cartridge
The 6.7 Neuber was launched in Europe 1911
The 270 win was launched in Europe 1917
Neuber and Sohn were in financial trouble
Winchester don't name their designer
..........could be they bought it?