anybody can identify this one? Looks like 6mm long flobert but I am not sure… 30,5x5,5mm (brass part 5mm heigth).
This is a 6 mm Longue Portee, made in France by Gevelot and Gaupillat.
Thanks a lot, is there any more extensive history about this cartridge?
It was popular in France and Germany in the late 19th century.
It is nothing more than a 6 mm Flobert cartidge with an elongated case to contain more powder.
There was also a 7 mm caliber.
For more information see municion.org