I need some information on this cartridge.
Size in millimetre.
I see no one has responded. It’s way outside my area of interest but could it be a 11.3mm Austrian Gasser?
If nothing else, my answer will at least bump your question back to the top of the pile.
The 11.3 Gasser has a head diameter of 14.05-14.90mm.
I think this is a .44-40 W.C.F. with a slightly longer case. All the dimension except case length fit. Since the round is rimmed, a slightly longer case would not matter as long as the overall length is about 40.4mm.
It looks like and the dimensions match those of a .44 WCF (44-40) Kynoch round I have.