a essential to know the break-up characteristics of candidate pellets. In this investigation test pellets were hurled mechanically against common roofing materials and soils, at speeds approximating the terminal velocities of air-dropped pellets, Study was then made of the effects of pellet composition and type of target on pellet break-up and scattering characteristics. It was found, in general, that the size of particles, and the area of scattering. decreased as the hardness of the pellet decreased. Hardness, in turn, varied with the pressure used to manufacture the pellet. Of the pellets tested, those which best withstood normal handling and also showed superior impact characteristics were of barium-lead and litharge composition, formed respectively under 20-tons/sq in. and 30- to hO-tons/sq in.pressure. Pellets striking wet soil or dry sand penetrated without break-up, but they fractured without penetration on impact against other dry soils.