Hi !
You have not been informed that this austrian revolver is a "dorn-revolver", i.e. has a "tige" in each chamber, to give at any bullet the same position, when charged.
In this way, the volume of the "tige", reduces the volume of the powder, so : EVERY evaluation of the charge must consider this constructive detail.
You must remember the short Lorenz "Dorn-stutzen M 1854", a rifle for austrian Yaegers, with a chamber of similar construction, also arrived in the US with the CW
The name of this Dorn-revolver is M 1861 Scheinigg; was made in 13,9 mm. and 11 mm. calibers. The 13,9 mm. was the same of the Lorenz rifle, and I suppose the bullet was the same.
It was a pistol for Officers, but the the Big and the smaller 11 mm. were also used on the civilian side.
In Europe is quite rare.
Hope to be of help to clarify the matter ..
Bye, Gianfranco