An improved apparatus and method for fitting a normally non-explosive containing
projectile with a spotting charge. A spotting charge
capsule is inserted into an opening in the front of a
projectile. The opening may be made by removing part of the
nose of the
projectile and making a shaped opening for inserting the spotting charge
capsule. The spotting charge
capsule includes an opening at its front and a bore behind the opening leading to a cavity for holding an explosive mixture, usually one or more pressed incendiary
pellets. The opening and bore together form a venturi, or venturi-like, tube. The tube ends short of the cavity leaving only a
thin wall between the bore and the explosive. On
impact on soft media, such as
dirt, sand or mud, the soft media will enter the tube and shear the
thin wall, creating a high speed flier plate that ignites the explosive mixture.