280 Grain 350 LEGEND Solid Copper Expanding Subsonic Bullets (Box Qty - 50) The Maker REX bullets are precision cnc machined, lead free, solid copper expanding projectiles.  REX projectiles expand to nearly 3 times the original diameter while maintaining nearly 100% of its original weight.  Each REX projectile has been engineered to perform in a given velocity range to provide unparalleled performance across a wide variety of calibers and weapons platforms