Apex Ammunition Waterfowl S3 Steel 20 Gauge 1 oz 3in 4 Shot Shotgun Ammo 25 Rounds. That means the most consistent and tightest performing patterns in an all-steel load. Specifications for Apex Ammunition Waterfowl S3 Steel 20 Gauge 1 oz 3'' 4 Shot Shotgun Ammunition: Manufacturer: Apex Ammunition Gauge: 20 Number of Rounds: 25 Shot Size: 4 Shell Length: 3 in Muzzle Velocity: 1250 ft/s Application: Hunting Waterfowl Included Accessories: None Shotgun Shot Weight: 1 oz Shot Material: Steel Primer Style: Centerfire Cartridge Case Material: Plastic Lead Free: Yes Package Contents: Apex Ammunition Waterfowl S3 Steel 20 Gauge 1 oz 3'' 4 Shot Shotgun Ammunition What is Apex Ammunition Waterfowl S3 Steel 20 Gauge 1 oz 3'' 4 Shot Shotgun Ammunition good for? The manufacturer suggests that it is best for waterfowl hunting.Apex Ammunition S320-4: Waterfowl S3 Steel 20 Gauge 1 oz 3in 4 Shot Shotgun Ammo 25 Rounds