To welder !
There is a book on Ferlach gunmakers ISBN 978-3-7084-0612-1 by Renate Jernej from 2018.
It has 3 pages on the family-saga of Peter Wernig. No info on any cartridge questions raised here.
If you can not get hold of the book I offer to send you a copy of the 3 pages .
If you let me know your name and address via the pm-feature I will mail it you or
if you want to stay anonymous to your next gundealer.
..
Weidmannsheil
F.N.