This a separate loading Q.F. cartridge and weighs approximately 49 lb. 4 oz. and is fitted with a percussion primer C/12 n.A. St.

The propellant charge weighs approximately 29 lb. 3 1/2 oz. and is of the double base type consisting basically of nitrocellulose and diethylene-glycol-dinitrate in tubular form. The sticks are 32.5 inches in length with an external and internal diameter of 0.3 inch and 0.12 inch respectively.

The propellant bag is stencilled 13,25 kg R.P./38 Bu (825 x 7,5/3). An analysis of this type of propellant averages: nitrocellulose 66.98 per cent, diethylene-glycol-dinitrate 28.87 per cent, akardite 2.84 per cent, graphite 0.21 per cent, sodium sulphate 0.14 per cent and volatile matter 0.96 per cent.

The brass case is the normal flanged type 32 inches in length and fitted at the mouth with a brass lid which extends an additional 2 inches to the front. The base of the case is stencilled in black with the weight of the propellant charge and bears the stamping "L/4,5".

The percussion primer C/12 n.A. is described in Pamphlet No. 4, page 10. The letters "St" added to the designation indicate that the primer is of steel.

Fig. 17