I have what I believe to be a 6.5 Carcano with the correct length and shape of bullet but it has what seems to be made with a full length collar with 3 slits and a smaller bullet sits in the collar. The head stamp is in a depressed ring and very difficult to read but I think it is F-P B-28 Thanks Vic
It is a 1st model Mitraglia bullet. It was used as a anti riot cartridge.
More or less we can call it a “shot” or “multiball” cartridge since inside the collar that resembles the original bullet there are several pieces of lead. Due to the slits, the jacket opens up after leaving the barrel and the lead pieces ( and the small lead bullet on the top) reach the target as a shot load.
It is not a rare item. Later the small lead bullet was put inside the jacket and the 2nd Mitraglia model bullet resembles an hollow point one.
The reported headstamp is correct. “FP” was used by Pirotecnico of Bologna from 1923 to 1929
perfect fit thanks vic