The French "rocket" rounds were development in 1947 and were apparently
based on the Langweiler principle. These were true bullets being fired from a
standard 9x19mm case. only 0ne specimen known and it is loaded in a
German WW II steel case. The development was done using existing cases
on hand so the case is of no importance.

1st Type bullet
Powder attached to rear and interior of bullet and the primer in case ignited
the powder. The powder travelled down the barrel with buller.

2nd Type bullet
This type bullet was truly a miniature rocket loaded in 9x19 mm case. The
primer ignited the propellant through the exhaust nozzle.   
Click here for details of the French Rocket development