I don't think the term "Lieferanten" on the Springer means manufacturer, rather I think it means "deliverer" (dealer). Markings on the rifle (other than re-proofs, if found) have little meaning concerning the 6.5x70R liner.
I had mentioned it about a month ago, in passing:
Julius Springer was not a mere Hoflieferant (purveyor to the Court), of which there were thousands in Austria-Hungary. He was a KAMMERLIEFERANT, who comprised a very tiny number altogether, and as such he was, in a way, more aristocratic than many courtiers.
Let me exemplify it a bit more colourfully:
Anybody who delivers toilet paper and toilet brushes of the Hofburg, to attend to the large amount of shit from the large workforce of the court, can be a Hoflieferant. But only a Kammerlieferant can knock at the august private rest room door and ask the Emperor to finish his solitary session, so that he may come in and change the toilet paper roll.
Carcano