This specific type of ammunition refers to cartridges designed for a particular firearm caliber, known for its high velocity and small diameter. These projectiles are engineered to defeat body armor and other protective barriers, typically utilizing specialized core materials like hardened steel or tungsten carbide. An example would be a steel-core projectile encased in a copper jacket within a 5.7x28mm cartridge casing, offered commercially.
The development of this ammunition reflects advancements in ballistics and materials science, catering to specialized operational requirements where defeating armor is paramount. Historically, such ammunition has played a role in military and law enforcement applications. The availability of this ammunition commercially raises significant considerations regarding public safety and potential misuse.