The cartridge is used in the 7.5 cm recoilless airboren gun (7,5 cm L.G. 40) and is of the separate loading Q.F. type. The diameter of the short brass case is large in comparison with the calibre of the gun and a distinctive feature is the black plastic disc at the base. The designation of the equipment is given on a label affixed to the cardboard cup which closes the mouth of the case.

The brass case is 6.1 inches in length and tapers from 4.8 inches in front of the flange to 4.5 inches at the mouth. The base of the case is designed to be destroyed on firing to allow some of the propellant gases to escape to the rear through a jet fitted to the breech block. A large circular hole formed in the base of the case is closed by a disc of black plastic. The disc is 3.4 inches in diameter and has a 0.65 inches primer hole at its centre.

The primer is the C/113 and is a percussion type which differs from the C/13 n.A. in having a base diaphragm of 0.023 inches instead of 0.051 inches.

The propellant charge is contained in a silk cylindrical bag which is choked at the neck and has an igniter pocket at the base. The bag bears the following markings in red:–

"7,5 cm L.G. 40
1,214 kg
Digl.Str.P. – 9,2 – (125 x 5 x 0,5)
Dbg. Nr. 9747
9.42"

The igniter pocket is pale mauve in colour and is sewn to form nine compartments, each of which contains a granular igniter composition. The weight of the filling is approximately 10 grams.

The charge weighs 2 lb. 10 oz. 13 dr. and consists of a double base propellant (diethyle-ne glycodinitrate and nitrocellulose) in the form of strips arranged vertically around a central tubular length. The strips are 4.92 inches long, 0.197 inches wide and 0.02 in-ches thick. The tubular propellant is closed at the ends by a disc of propellant and is 4.7 inches long. The external diameter is 0.55 inches and the internal 0.49 inches. The tube contains 247 grains of gunpowder.

The charge is retained in the case by an inverted cardboard cup in the mouth of the case. The cup carries a label giving the same particulars as those marked on the bag.