Cap is made of steel Chris.
BD
The 1951 Damiler armoured car armament manual lists:
Shot APCBC/T Mk 9
Shot AP/T Mk 9
Shot practice pointed/T Mk 7, 9 and 10
Shell HE HV/T Mk 2
Shot APSV Mk 1
Shot APSV Mk 2
The APCBC is described as the standard service round.
The colours of the shot from the 1951 manual are black body, red markings and blue tip.