Lancaster,

you seem to have all the old catalogs that I have, plus much more!
Also apparently the great book "Die Jagd-Feuergewehre" by Adolf Zimmer from 1877.

What I can contribute is an excerpt from "Das Schiesswesen" from 1900 - this was an addendum to the hunting journal "Deutsche Jaeger-Zeitung".
This is the first solid ballistic table that I know of, with cartridges ranging from 6 mm Lee Navy to 4 bore elefant rifle. And there is one entry for a 24 gauge Lancaster cartridge.
I had no scanner available, so I copied the whole thing into an Excel file.
I have no means to post files or pictures here - could you assist me?

Fuhrmann