Numerous products can be formed by combining a low melting matrix made up of one or more metals and high melting, high density metal particles and wherein the products can be formed by adding the high density particles to a molten matrix metal and casting same, mixing powders of all the metals together,...http://www.google.es/patents/US5877437?utm_source=gb-gplus-sharePatente US5877437 - High density projectile
