The cartridge is ot the separate-loading Q.F. type consisting of a brass case containing a charge of double base propellant in 6 sections. The case is fitted with a C/12 percus-sion primer and is closed at the mouth by a cardboard cup. A special charge, consisting of sections 7 and 8, is packed in a cylindrical metal container. These sections are inser-ted in the cartridge case, in place of the normal contents, when required.

The brass case is 10.2 inches in length and has stamped in the base the model number of the case, "6350", and the designation of the equipment "s.F.H. 18".

The charge, comprising sections No. 1 to 6 inclusive, consists of 2 lb. 13 oz. 15 dr. of double base flake propellant (diethylene-glycoldinitrate and nitrocellulose) and a 1 lb. 3 oz. 6 dr. igniter also of double base propellant flake (nitorglycerine and nitrocellulose). These weights are based on a normal charge temperature of 25° C.

Each of the sections is enclosed in a flat bag of artifical silk. The bags for sections No. 1 and No. 2 are semi-circular, No. 1 being stitched to the top of circular igniter bag and No. 2 being placed beside it to form a circle. The remaining bags are circular, the diame-ter being approximately 6.5 inches. The bags are stencilled in black to indicate the desig-nation of the equipment, the charge numeral, the weight, nature and size of the propel-lant and the dates of manufacture and filling. Sections Nos. 1, 5 and 6 are also stencilled "Bleidraht im Beutel" to indicate the inclusion of lead wire in the bag as a decoppering agent. The standard normal for the charge temperature is stencilled in red, "(P.T. + 25°C)".

The weights, natures and sizes of the flake propellants, as marked on the bags, are as follows:–

The special supercharge comprises sections Nos. 7 and 8 and is packed in a cylindrical metal container. The lid of the container is stencilled "D Sondkart 7 u. 8 s.F.H. 18 o.B.D.". The letters "o.B.D." indicate the absence of the lead wire decoppering agent. An instructional label on the container is worded to the effect that before inserting sections 7 and 8 in the cartridge case, the sections on the case, including the igniter, should be removed.

Section No. 7 is contained in a cylindrical bag of artificial silk about 8.5 inches long and 6 inches in diameter with an igniter formed in the base and choked at the neck. The bag is marked with the charge numeral "7D" in black. The numeral is enclosed by a red circle. The following details are stencilled on the side of the bag in black:–

The place and date of manufacture of the propellant and the filling of the section ar also given. The marking "P.T. + 25° C" is in red.

The igniter at the base of the bag is marked "440 g Digl.Bl.P. – 10,5 – (3 x 3 x 0,8)".

The propellant charge, as indicated by the marking, consists of 5 lb. 4 oz. 3 dr. of double base propellant (diethylene-glycoldinitrate and nitrocellulose) in the form of perforated discs. The dimensions of the disc being:– thickness 0.075, diameter 0.6, diameter of hole 0.16 inches.

The propellant filling used in the igniter, as indicated by the markings, consists of 15 oz. 8 dr. of double base propellant (diethylene-glycoldinitrate and nitrocellulose) in the form of square flake. The dimensions of the flake are: 0.118 x 0.118 x 0.032 inches.

Section No. 8 is contained in a flat, circular bag of artificial silk about 7 inches in diame-ter. The bag is marked with the charge numeral "8D" in black with a red circle around the numeral. The remaining markings are the same as those on the side of Section 7, except that the weight is given as "768 g", i.e., 1 lb. 11 oz. 1 dr.