This fixed Q.F. round is fired from the high velocity 2 cm anti-tank gun, Model 41 (Pz.B. 41), which is of the coned bore type.

The brass cartridge case which is necked and fitted with a blued steel primer of the nor-mal German design contains a 2347.5 grain propellant charge of graphited N.C.T. The propellant is 0.51 inches in diameter and in lengths of 0.086 inches.

The normal projectile consists of an armour piercing tungsten carbide core fitted with a lead sheath in rear of the ogive. The core is contained in an iron alloy sleeve at the for-ward end of which is formed a flange which slopes towards the base and has five equi-distant holes in it. A cup, with a similar flange formed around its base, is fitted over the rear end of the sleeve and core. The holes in the forward flange are probably intended to allow air to escape from between the flanges when thease are crushed in passing through the tapered bore. A hollow ballistic cap is fitted to the forward end of the sleeve. This cap is probably of magnesium alloy.

The flanges of the projectile are a close fit in the neck of the cartridge case where the projectile is secured by the mouth of the case being lightly spun over the forward flange. The joint is painted red. The mouth of the case is also lightly indented into the rear flan-ge at four points.

Cartridge.

Case.

Projectile.

Core.

Fig. 13 – German Cartridge, Q.F., A.P., 28/20 mm, Model 41