Cartridge, 105 mm: WP/Smoke, M60

for the fuze. On the M60 the adaptor is machined to accept a tubular steel M5 burster casing located towards the base of the shell body; the burster charge is approximately 113 g of Tetrytol in pellet form. The shell filling consists of 1.737 kg of cast White Phosphorus (WP) although other smoke producing substances such as titanium tetrachloride have been employed. The shell normally operates on impact when the point detonating or MTSQ nose fuze initiates a small charge under the fuze and creates a flash to ignite the burster charge. The burster charge is sufficient to rupture the shell body to release the WP filling which, on contact with the atmosphere, creates a dense white smoke cloud. The 105 mm WP/Smoke M60 uses a steel burster casing for the M5 burster containing Tetrytol. Before loading, the required increments are arranged inside the case with the No 1 increment, the base charge, at the bottom and the No 7 increment located towards the case mouth. The other increments are arranged around the walls of the case and around the primer tube. Charge 1 is the base charge consisting of 238.42 g of propellant M1 (small size). Charge 2 consists of Charge 1 plus a 41.11 g increment of propellant M1 (small size). Nominal charge weight is 279.53 g. Charge 3 consists of Charge 2 plus a 70.87 g increment of propellant M1 (large size). Nominal charge weight is 350.4 g. Charge 4 consists of Charge 3 plus a 96.39 g increment of propellant M1 (large size). Nominal charge weight is 446.79 g. Charge 5 consists of Charge 4 plus a 153.09 g increment of propellant M1 (large size) and a sheet of lead which functions as a decoppering agent. Nominal charge weight is 599.88 g.