Here is something you certainly do not see every day.  Arsenal dummy rounds  for use in 7.5×55 Swiss.  Used for training purposes and sundry.  The rounds have something inside that  gives them the sound of powder when you hold it close to the ear and shake.  And as you can see in the picture an indent for the firing pin to strike. The stripper clip is the usual construction  but painted red for ID’ing.  The charger for rifles before the adoption of the K-31.