HEVI-Shot HEVI-BISMUTH WATERFOWL 410 Gauge 9/16oz 3in #4 Centerfire Shotgun Ammo 25 Rounds. You want a shell that delivers maximum force at a price that doesn't force you to take out a second mortgage. These HEVI-Bismuth Waterfowl shells utilize bismuth which is 22percent denser than steel to deliver more downrange lethality at an affordable price. And this 410 Gauge Ammo from HEVI-Shot is safe for older fixed choke and fine classic doubles shotguns. Shot Density: 9.6 g/cc. Specifications for HEVI-Shot HEVI-BISMUTH WATERFOWL 410 Gauge 9/16oz 3in Shotgun Ammunition: Manufacturer: HEVI-Shot Gauge: .410 Number of Rounds: 25 Shell Length: 3 in Muzzle Velocity: 1300 ft/s Application: Waterfowl Shotgun Shot Weight: 9/16 oz Shot Material: Bismuth Primer Style: Centerfire Cartridge Case Material: Brass Lead Free: No Package Contents: HEVI-Shot HEVI-BISMUTH WATERFOWL 410 Gauge 9/16oz 3in Shotgun Ammunition What is HEVI-Shot HEVI-BISMUTH WATERFOWL 410 Gauge 9/16oz 3in Shotgun Ammunition good for? The manufacturer says that it is best for waterfowl.HEVI-Shot HS19004: HEVI-BISMUTH WATERFOWL 410 Gauge 9/16oz 3in #4 Centerfire Shotgun Ammo 25 Rounds