This paper describes research that has been undertaken to develop a low-cost vehicle-mounted gun system to provide for the rapid disposal of surface deployed munitions (principally mines) from up to 100 m distance. Inert high-shock projectiles with optimized internal, external and terminal ballistic performance have been developed during this study. Work on shock wave interaction was reviewed in terms of the Rankine-Hugoniot jump equations, and Walker and Wasley criterion has been employed using two modifications from James to predict initiation in this divergent shock application.