Hornady Custom Ammunition 303 British 150 Grain InterLock Spire Point (20pk)Hornady Custom grade ammunition provides custom ammunition in a factory production loading. Built to the tightest tolerances for peak performance rivaling and sometimes surpassing handloads in many guns. The InterLock is designed to be a devastating hunting bullet and nothing less. The InterLock Ring a Hornady exclusive ensures that the core and jacket remain locked during expansion. The InterLock retains more mass, energy and momentum after impact