Hornady's GMX bullet gives hunters an expanding monolithic bullet that delivers ultra-flat trajectories and devastating terminal performance. The gilding metal bullet is harder and tougher than a copper bullet and also helps to reduce fouling in the barrel. GMX bullet's expand 1-1/2 times its original size and retains 95% of its original weight. Their boat tail design reduces bearing surface in order to increase accuracy and consistency. This bullet has been certified as California compliant for shooting in lead free areas. This is not loaded ammunition.