Help with cartridge identification


I need some help to identify this cartridge please.
It has the following markings: On top H - on left 18 - on right 98 - on bottom K&C.
Thnks very much.


This should be Austrian Keller & Co.

But for an ID request it is highly important to tell the caliber of the case.


I have measured the case and it seems to be a 7.4 or 7.5 mm