This is strictly from memory and is only my opinion, but I always heard and read that Roberts tried many different cases and combinations of dimensions before finally deciding upon the 7x57 case necked down (or the 6x57 necked up or 6.5x57 necked down, depending upon your perspective, G). We also know that Neidner tried many different combinations as well, and who's to say that Neidner and Roberts didn't collaborate or at least exchange info about this particular cartridge? I can visualize a scenario in which they collaborated and then Neidner named this particular chambering for his colleague.
IMO it may also be significant that the original Remington 30s were marked '25 Remington Roberts' or '257 Remington Roberts', underscoring the fact that there were other similar 25-caliber Roberts cartridges known to the shooters of the day. IMO it's very possible that Remington chose this designation not only for their own publicity but also to differentiate it from the other known 25-cal Roberts developments. Of course all these other Roberts and Neidner cartridges have faded into obscurity except for the 257 and 25-06, and IMO the 'Remington' designator was then dropped since it was no longer necessary.
Of course it could have been that Remington just added another word to their already-existing '25 Remington' stamp, and that I'm full of it as usual.
Regards, Joe
