A cup and plug assembly of a base for a polymer based ammunition cartridge case body includes a cylindrical sleeve joined to the base. A region is imaged to determine a location in which to calculate shear velocity. If the alias page table does not have space for the entry, a new page is used to map the next virtual page of the alias page table. In addition, other uses for the proppants of the present invention are further disclosed, as well as methods of making the proppants.