Remington's Core Lokt Ultra Magnum is a revolution in high performance big game ammunition. In each of its calibers, the Remington Ultra Mag cartridges produce the highest velocities, the flattest trajectories and the highest energy levels available to big game hunters today. This is due to their large case capacities and innovative, non-belted magnum case designs. These cases hold dramatically more powder and align with unmatched precision within the bore, making the world's most lethal family of cartridges the most accurate, as well.