recoil springs
The DWM drawings for the vintage Lugers show the same spring for both calibers in the "Old Model" (flat recoil spring) and two different springs for the New Model (Coiled spring). I suspect that with the change in recoil springs the 9 mm load was perked up a bit.
I've sometimes thought the 9 mm Glisenti cartridge was just the 9 mm Parabellum as loaded pre spring change. Apparently the Glisenti pistol was first chambered for the 7.65 mm parabellum.
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