Although the cartridges are different in dimensions (and loads!!), they share a common background.
Both the .30 luger (7.65mm Parabellum) and the .30 Mauser (7.63mm Mauser) started out as the 7.65mm Borchardt round and for a short while there was no visible difference between the Borchardt and the Mauser rounds, except for the packaging labels.
DWM/Georg Luger created the .30 luger round by effectively shortening the length of the 7.65mm Borchardt round, while Mauser's C/96 appearantly needed some more 'oompf' and the Mauser load was increased while the dimensions remained the same as those of the Borchardt round. Of course, later the Russians took off with the .30 Mauser and created their 7.62 Tokarev round, which basically again is a .30 Mauser round and dimensionally the same as the Mauser and the Borchardt. Again it's the increased loads that appeared at a later date that separated the Tokarev from the Mauser and the Borchard round...
...You can write a book about these things...
In any case, don't get your .30's mixed up, will hurt guns and owners..
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