Spheres of copper, lead, tin, iron, aluminum, zinc, silver, and lead‐tin alloys were accelerated to velocities of 0.75 to 2.25 km/sec and impacted normally upon targets of the same material as the pellets. Conditions were maintained so that pellets lost no mass before striking the target. The target mass was large compared to the mass of the pellet, so the targets could be considered semi‐infinite.The volume of the crater produced was found to be directly proportional to the kinetic energy of the pellet in the energy range investigated.The penetration varied linearly with the velocity or momentum of the pellet. The area of the crater as measured in the plane of the original surface of the target was found to be directly proportional to the momentum of the pellet at the time of the impact.In the case of the lead‐tin alloy series, a correlation was observed between the crater parameters, the phase diagram of the alloys, and various functions of the pellet mass and velocity for the following series of alloys: 100% lead; 90% lead, 10% tin;...; 10% lead, 90% tin; 100% tin.