Back from France, I found an original case for rifles, an original wooden box for one cartouche and (ultra rare) two shot-shells.
The diameter is 8.5 mm , the lenght 16.5 mm and the weight 3.5 ... 4 g. The front is probably filled with wax.
Here some pictures that can be enlarged twice.
atb Jochen
http://sta.sh/2bdiayj9jie?edit=1