Image Number 4 for United States Patent #3981242.
Internally fragmented shot is stage released from a cartridge so as to yi a double cone-pattern of shot. The cartridge utilizes a two step fragment release design which expels fragments at two separate points on the projectile trajectory. Parasitic initiation of separate delay trains cause expulsion of fragmented shot so that fragment patterns achieved by each group of fragments yield a dense fragment pattern from point of release over a wider angle. Higher cartridge lethality is attained because an initial fragment pattern overlaps and includes a second fragment pattern. Ability of the design to initiate release of fragments at alternate positions in the projectile's trajectory results in an extended range "shot" capability.