Abstract: In a practice ammunition including a self-destruct, fin-stabilized subprotile containing an elongated body composed of a plurality of mating segments having means for releasably holding said segments together, the means includes a heat sensitive nose cap including a pyrotechnic composition, which contains a fuel and an oxidizing agent. The nose cap holds the forward portions of the segments together, and due to the pyrotechnic composition, is adapted to burn and disintegrate essentially instantaneously in flight at a predetermined aerodynamic temperature to release the segments, whereby the distance at which the subprojectile self-destructs in its trajectory can be realized more accurately and reliably.