A shaped charge explosive device which includes an axially symmetric body of explosive material, a liner lining the forward end of the body, and a detonator disposed at the bottom of the body. The liner has an apex disposed along the symmetry axis of the body and the forward end of the body contains a gas filled cavity which overlaps the apex of the liner. When the detonator detonates the explosive material, a detonation wave is produced that collapses the liner into a plurality of liner parts which are projected against an external target. The gas filled cavity shapes the detonation wave so that the detonation wave impacts the liner at the most favorable angle to transfer energy to the liner and maximize the effective penetration of the external target by the projected liner parts.