In the mid-50s, Batignolles-Châtillon developed an original design of the heavy SPG that featured some elements of the U.S. M47 chassis. The vehicle was equipped with a 155 mm howitzer installed into the rotating turret. At least one prototype was built. Never saw mass production.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.