1 Inch ammunition

The cartridge I refer to here is water under the bridge, as I have long since ‘lost’ it, but when I recently browsed through photographs on my pc I came across it again. I always thought that the round second from the right (next to the South African .55 Boyes round) must have been some sort of 1 inch cartridge, similar to the 1 inch Nordenfeld. All I can remember is that the bullet was magnetic (steel/iron) and that the headstamp was Italian (BPD or something with date like on Glisenti or Carcano ammo)Foto%201 . Any ideas to what it could have been?

1" Nordenfeldt

As Orange said, 1 inch Nordenfeldt-