The cartridge is of the separate loading type, and is used in the 100 mm 17 calibre how-itzer.

The brass case is fitted with a Model 35 percussion primer, and contains a 1 lb. 3 oz. 12 dr. propellant charge in five sections. The mouth of the case is closed by a cardboard cup. The case is 5.2 inches in length.

The propellant charge consists of five bags, one of 280 grams and four of 70 grams of flake propellant. The dimensions of the flake are 0.59 x 0.59 x 0.059 inches. Details of the composition are not yet available. The 280 gram section is "Charge 1" and is marked "Elemento Fondamentale". The 70 gram sections are marked "Elemento Aggiuntivo". Each of the sections is marked with the designation of the equipment, the weight of the sec-tion and the dimensions of the flake.