OneStrike 223 55 grain is designed for use inside and around sensitive areas, metal enclosures, home protection and high crowd areas where shooting through a soft target or structure. The H.E.T (high energy transfer) frangible core provides the load to fragment on extreme light barriers with a direct hit at 10 feet using a 223/556. Onestrike is designed to be more explosive going through certain light barriers to prevent from traveling through walls