Rocket assisted projectile and cartridge with time delay ignition and sealing arrangement

A cartridge arrangement having a rocket assisted projectile for firing therefrom by ignition of propellant in the cartridge case and for subsequent ignition of a rocket grain within the projectile, in which the projectile has a sealed tubular chamber cavity encompassing a tubular or ring shaped end burning rocket grain, the rear end of which chamber is formed by a combined nozzle block and rear penetrator support which has nozzle openings sealed by ignitable time delay igniter plugs, and the outer, inner, and forward extremities of which are bounded by a thin-walled projectile case, a cylindrical penetrator, and a forward penetrator support, and which ignitable time delay igniter plugs are externally ignitable by the burning of the propellant to enable subsequent ignition of the adjacent end of the rocket grain.