This study was undertaken to examine the behavior of heterogeneous gun propellants when they are impacted by shaped-charge jets. In the immediate area surrounding the impact point, the pressure is believed to be above the detonation pressure of the full-density propellant. However, a detonation does not necessarily occur, and if it does, the detonation does not necessarily propagate. This is a function of grain size, web, perf pattern, jet diameter, propellant failure diameter, and composition. The investigators hope to eventually understand the mechanism and physics of the failure of detonation in these systems. This report summarizes the initial work performed in support of the study. The results presented here formed the groundwork for a more specific effort, which is continuing. 18 figs., 1 tab