Each brown cardboard box contains 20 rounds of .300-grain jacketed hollow-point extreme penetration ammunition. This MRI brand of ammunition is manufactured for Magnum Research by Hornady – Caliber: 50 Action Express – Bullet Type: Jacketed Hollow Point – Bullet Weight: 300 gr – Muzzle Energy: 1450 ft / lbs – Muzzle Velocity: 1475 fps – Rounds Per Box: 20