Powerstrike 9 mm 115 grain is a jacketed compressed powder metal core with the protection of the copper jacket to allow the powder core to be compacted at a lower pressure so that it is more explosive when it hits soft fluid filled tissue which is what causes the frangible core to fragment. When PowerStrikes impacts soft fluid filled tissue and begins to fragment, it picks up the surrounding damaged tissue and rams it forward being aided from the Pressurized fluid with exponentially increases the frontal area of the shock wave and wound cavity causing increased hydrostatic shock.