Munition for low-pressure firing of projectiles from large-caliber guns

Ammunition for low-pressure launching of projectiles capable of being fired from large-caliber guns, comprising:

• a cylindrical case having a closed end, said closed end including a coaxial, concentric chamber;
• a projectile located in an end of said cylindrical case opposite said closed end;
• a diffuser device having a coaxial chamber of a nominal diameter and a nominal cross-sectional area;
• a blank cartridge propulsion means housed in said coaxial chamber of said diffuser device for propelling the projectile, to define a propulsion means-diffuser device combination, said propulsion means-diffuser device combination being housed in said coaxial, concentric chamber of said cylindrical case, wherein said coaxial chamber of said diffuser device is coupled to lateral orifices peripherally arranged on said diffuser device, said orifices each having diameters and cross sectional areas, the combined cross-sectional areas of the orifices being larger than the nominal cross-sectional area of said coaxial chamber of said diffuser device, so as to diffuse pressure build-up via said orifices upon firing to within said blank cartridge propulsion means and thereby prevent pressure build-up within said diffuser device chamber.