for example at 24 in fig5 will cause the jet to neck down at that point and break thus an excess of holes can be used to induce a preferential breakup or particulation of the shaped charge jet while a particular embodiment of the invention is shown in fig3 and 4 which utilizes a hemispherical liner the invention can also be applied to other types of warhead liners and liner geometrics such as tapered hemispherical liners truncated hemispherical liners self forging fragment liners ballistic discs misnay chardin liners conical liners and in particular all arcuate shaped liners which are concave when viewed from outside the device the liner can be constructed of any material capable of forming a coherent jet such as copper aluminum or steel as is well known in the art as noted above the provision of holes in the liner will increase the performance of the warhead or explosive device utilizing the liner against targets consisting of spaced plates inclined at angles of obliquity to the jet path such targets include armored vehicles tanks and the like a more advantageous velocity distribution in the jet is provided by slowing down the front portion of the jet without altering the velocity of the rear portion of the jet a main jet designed to follow a secondary or precursor jet is slowed down according to the invention if the main jet overtakes the precursor jet prior to impact with the target the provision of excess holes along the azimuthal plane will.