The shell is fired from the Q.F. 75 mm 27 calibre gun-howitzer and the Q.F. 75 mm 13 calibre howitzer, with a separate loading Q.F. cartridge.

The head of the shell, including the fuze-hole adapter, is red. The remainder of the shell is pale blue, with a green band above the driving band, and is stencilled "75/13/27". The T.N.T. bursting charge is indicating by the stencilling "Tritolo". The overall length of the fuzed shell is 11 inches and the weight, filled and fuzed, is 13 lb. 11 oz. 8 dr.

The shell is machined from rolled bar steel and has a cylindrical band or neck formed in the head, with two fixing screws for the fuze-hole adapter. The driving band is of cop-per, and a mild steel base plate is attached by soldering. The cavity for the bursting charge is of the parallel wall type.

The fuze-hole adapter is of steel and is shaped at the head to form the nose of the as-sembled projectile. The adapter is screw-threaded externally for insertion in the shell and internally to receive the fuze and the gaine. A fixing screw is provi-ded for the fuze.

The weight of the empty shell, including the adapter, 12.1 lb. The adapter alone weight 1.18 lb. The length of the shell body is 9.5 inches. With the adapter fitted, the length is 10.5 inches.

The bursting charge consists of cast T.N.T., with an exploder cavity the wall of which is supported by an aluminium exploder container. A felt washer is inserted the top of the bursting charge and the underside of the adapter. The weight of the bursting charge is 15.25 oz.

The exploder consists of 14 drams of ballistite flake in a cylindrical container of varnished tinned plate. The container is 2.9 inches in length and 0.87 inch in diameter, with a small central hole at each end. The holes are lightly closed by a cloth gauze disc on the inner face of the disc forming the end. The ballistite consists of 51 per cent of nitrocellulose (nitrogen content 13 per cent) and 49 per cent of nitroglycerine. Chalk is included as a stabilizer.

A description of the fuze, the Inneschi graze fuze, and the 2.3 gram ballistite gaine used in this shell are included in this pamphlet.