The results of model studies and experiments related to response of truncated conical shells to impulsive loading are presented. Theory of modeling is discussed in some detail, with particular emphasis on scaling of elastic and plastic response of shell structures when these structures are made of material different from those in a prototype structure (dissimilar materials). Work on development of dissimilar model materials and techniques for fabrication of conical shell models is then presented. Next, the experimental phase of the program, including test arrangement and instrumentation for both shock-tube and sprayed-explosive loadings, and results for maximum transient and residual displacements of the conical shells are discussed. The report is completed with conclusions on the study, and recommendations for further work to corroborate the concept of modeling of dynamic structural response using dissimilar materials. The report also includes supporting theoretical analyses as appendices.