The 100% copper bullet uses a polymer tip to enhance expansion at all velocities, and the boat-tail design boosts ballistic coefficient for exceptional long-range performance. TMZ's expand on impact to form six razor-sharp copper petals for massive shock and penetration yet retains 100% of its original weight. The easy to load sabot design creates a tight gas seal for maximum velocities. .50 caliber. Models: 250 gr. or 290 gr. Package of 24.