Overall cartridge length of 9X19 allows it to fit in the chamber of the longer 7.63 Mauser due to the Mauser's bottlenecked case. Headspacing is completely different as the Mauser headspaces on the cartridges shoulder while the 9mm as with all straight sided or slightly tapered autoloading cartridges headspaces on the case mouth.
I would invite others to comment of the feasibility pushing a .355 bulet through 5 1/2 inches of .308 barrel. What chamber pressure would be needed to accomplish such a task?
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Rich
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