Paul Mauser Private Archive

[Vlim]

I don't think so. I think that initially the standard 403 was used in both the Borchardt and the Mauser C96. It is difficult to distinguish between one or the other without the available packaging. To make things worse, the earliest rounds didn't have the case number on them, just a mere 'D.M. K' (Deutsche Metallpatronefabrik Karlsruhe).

The one on the left is such an early cartridge, it predates 1900, compared to a later 403 round.