RIO Ammunition Game Load Heavy Field .410 Gauge 1/2 oz 2 1/2in MAX Shotgun Ammo #8 25 Rounds. These game loads come in .410 bore size to suit your particular weapon. They measure 2 1/2 inches in length and deliver an impressive muzzle velocity of up to 1200 feet per second. If you are in the market for a heavy-duty and reliable game load look no further than the Rio Heavy Field line of sub-gauge game loads. Specifications for RIO Ammunition Game Load Heavy Field .410 Gauge 1/2 oz 2 1/2'' MAX Shotgun Ammunition: Manufacturer: RIO Ammunition Gauge: .410 Number of Rounds: 25 Shot Size: 8 Shell Length: 2 1/2 in Muzzle Velocity: 1200 ft/s Application: Field Shotgun Shot Weight: 1/2 oz Shot Material: Lead Primer Style: Centerfire Cartridge Case Material: Plastic Lead Free: No Package Contents: RIO Ammunition Game Load Heavy Field .410 Gauge 1/2 oz 2 1/2'' MAX Shotgun Ammunition What is RIO Ammunition Game Load Heavy Field .410 Gauge 1/2 oz 2 1/2'' MAX Shotgun Ammunition good for? The manufacturer says that it is suitable for field.RIO Ammunition RC368: Game Load Heavy Field .410 Gauge 1/2 oz 2 1/2in MAX Shotgun Ammo #8 25 Rounds