A dual-mass warhead, comprising: a case formed of a material that is pulverized upon detonation; an explosive containment structure inside the case, said containment structure having an aft section that defines a void space between the case and the containment structure; an explosive in the explosive containment structure; an initiator to initiate detonation of the explosive; a side-firing fragmentation assembly including first metal fragments in the void space that expels the first metal fragments in a side-firing pattern upon detonation of the explosive; and a forward-firing fragmentation assembly including second metal fragments positioned fore of the explosive that expels the second metal fragments in a forward-firing pattern upon detonation of the explosive, characterized in that: the aft section of the containment structure and the explosive tapers from a first diameter approximately equal to the inner dimension of the case to a second smaller dimension at an aft end of the explosive, said initiator positioned aft to initiate detonation at the aft end of the explosive; the tapering of the explosive and containment structure create the void space for the side-firing fragmentation assembly; and the forward-firing and side-firing fragmentation assemblies (50, 60) are spaced apart by a central section of the case that is pulverized upon detonation. a case formed of a material that is pulverized upon detonation; an explosive containment structure inside the case, said containment structure having an aft section that defines a void space between the case and the containment structure; an explosive in the explosive containment structure; an initiator to initiate detonation of the explosive; a side-firing fragmentation assembly including first metal fragments in the void space that expels the first metal fragments in a side-firing pattern upon detonation of the explosive; and a forward-firing fragmentation assembly including second metal fragments positioned fore of the explosive that expels the second metal fragments in a forward-firing pattern upon detonation of the explosive, characterized in that: the aft section of the containment structure and the explosive tapers from a first diameter approximately equal to the inner dimension of the case to a second smaller dimension at an aft end of the explosive, said initiator positioned aft to initiate detonation at the aft end of the explosive; the tapering of the explosive and containment structure create the void space for the side-firing fragmentation assembly; and the forward-firing and side-firing fragmentation assemblies (50, 60) are spaced apart by a central section of the case that is pulverized upon detonation. the aft section of the containment structure and the explosive tapers from a first diameter approximately equal to the inner dimension of the case to a second smaller dimension at an aft end of the explosive, said initiator positioned aft to initiate detonation at the aft end of the explosive; the tapering of the explosive and containment structure create the void space for the side-firing fragmentation assembly; and the forward-firing and side-firing fragmentation assemblies (50, 60) are spaced apart by a central section of the case that is pulverized upon detonation.