The charges for these cases are made up in a very similar manner to those already described for breech loading. Where necessary, distance pieces formed of papier-mâché tubes and felt wads are used to fill up the space in the case to prevent any movement of the charge. The mouth of the case is closed either by the base end of the projectile, in which case it is called "fixed ammunition" or "simultaneous loading ammunition" or by a metallic cap, when it is called "separate loading ammunition," projectile and charge being thus loaded by separate operations.