M4220:
When I return home this evening, I have some books with good Eurpean Sporting Cartridge reference. By coincidence, the main book is called European Sporting Cartridges! I is more a cartridge collectors book, but to find dimensions of many obsolete and very limited production oldies, this is a good source.
I also have a couple of capes. One is German by F.R. Neumeyer in a vey odd 9.5X56 bottleneck. From the books, I found I can make brass by reforming 11.15X60R (11Mauser). The previous post may well be the case for a .450 NP based case. This was popular for some time. My other is a Huskavarna SXS cape in a 12.7X44R. Both have shot barrels in 16 ga 2.5 (65mm).
I am fasinated by the SxS combos and these old calibers. I will let you know what I find.
Congrats on the find and aquasition. Post photos.
I will when I figure out how.