Here some pic from 2 boxes of them, one with markings 6mm Double Culot, (2-piece case) and the other with (single) brass cases and marked Bosquette .
Besides the different construction , is there any other difference between the 2, and if not, why they are produced that way?
On the Boxes both are stating Calibre 6mm F (= Flobert)…
Here the Bosquettes:
and here the Double Culot: