RIO Ammunition Royal BlueSteel Magnum 12 Gauge 1 3/8 oz 3in #4 Shotgun Ammo 25 Rounds. When hunting takes place in wetland areas distances are long and opportunities are scarce we must have trustworthy ammunition. For this reason RIO Royal BlueSteel Magnum which is manufactured with the proprietary perfectly spherical steel shot offers velocities above 1500 fps delivering incredible energy on target and great efficiency in bringing in ducks and geese. This is why it is the choice hunting cartridge of thousands of waterfowl hunters season after season. Specifications for RIO Ammunition Royal BlueSteel Magnum 12 Gauge 1 3/8 oz 3'' #4 Shotgun Ammunition: Manufacturer: RIO Ammunition Gauge: 12 Number of Rounds: 25 Shot Size: 4 Shell Length: 3 in Muzzle Velocity: 1300 ft/s Application: Hunting Waterfowl Included Accessories: None Shotgun Shot Weight: 1 3/8 oz Shot Material: Steel Primer Style: Centerfire Cartridge Case Material: Plastic Lead Free: Yes Velocity: 1300 fps Application: Hunting Package Contents: RIO Ammunition Royal BlueSteel Magnum 12 Gauge 1 3/8 oz 3'' #4 Shotgun Ammunition What is RIO Ammunition Royal BlueSteel Magnum 12 Gauge 1 3/8 oz 3'' #4 Shotgun Ammunition good for? The manufacturer says that it is suitable for waterfowl hunting.RIO Ammunition RBSM404: Royal BlueSteel Magnum 12 Gauge 1 3/8 oz 3in #4 Shotgun Ammo 25 Rounds