FN:
According to the DWM pre-WWI publication " The Parabellum Automatic Pistol", (the English version of "Die Selbstlade-Pistole "Parabellum"), the rate is the same for both the 7.65mm and 9mm applications, that being one turn in 9.84 inches (or 250 mm).
You might also want to know, that the original powder charge was also exactly the same, for both the 7.65mm and 9mm, at 5.4 grs.
My Mauser manual of the 1930s "Original Mauser Parabellum Selbstlade-Pistole" lists the exact same turn rate, at 250 mm, for both calibers.
The rates didn't change during the period of the original German production.
Sieger
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