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The only ballistic figures I found were in the 1900 article by Preuss mentioned in the other thread:
a 24 bore (14.7 mm or .58'') cape gun used a ca. 22 gram (340 grains) cats head bullet behind 2.5 38.6 grains) grams of black powder, giving a velocity of 265 m/s (870 fps) at 25 meters.


The 1877 book by Zimmer gives slightly stronger, but rather general loading recommendations:
caliber between 13.5 mm and 14.5 mm (.53 to .57'')
bullet weight between 18 g and 25 g (278 to 386 grains)
powder charge between 3 g and 3.5 g (46 3 to 54 grains)
ratio powder to bullet between 1:6 and 1:7
Bullet velocity to be around 300 m/s. (ca. 1000 fps)

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I have translated these numbers to "non-metrics", for easier cross-reference.
A note to the reference of ca. 1000 fps velocity: this probably is not muzzle velocity. Zimmer says: "a bullet usually covers the distance of 1000 feet in one second". He was obviously not able to measure muzzle velocity. So this may be a mean number, corresponding to a muzzle velocity of roughly 400 m/s or 1300 fps.

Fuhrmann

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