Lightfield Ammunition Lightfield 20ga 2-3/4'' Double Ball. The aversive conditioning of large heavy muscled animals is a growing trend with specific range demands. The new Lightfield line includes patent pending designs with velocity and kinetic energies calibrated for range specific applications. The new line is intended exclusively for wildlife control and provides effective and affordable solutions for close mid-range and extended range targets. Lightfield believes ammunition that is safe and effective at close range on humans may be underpowered for large animals at greater ranges. Likewise loads that are effective at extended ranges may be too powerful for humans at close range. In response to that situation Lightfield has calibrated its wildlife control line into the following basic classes: Close range 8-25 yards Mid-range 15-40 yards and Extended range 30+ yard. C Specifications for Lightfield Ammunition Lightfield 20ga 2-3/4" Double Ball: Manufacturer: Lightfield Ammunition Gauge: 20 Number of Rounds: 5 Shell Length: 2 3/4 in Muzzle Velocity: 700 ft/s Application: Self-Defense Included Accessories: None Primer Style: Centerfire Lead Free: No Velocity: 900 fps Dimensions: 0.90 X 3.55 X 4.60 in Length: 2.75 in Package Contents: Lightfield Ammunition Lightfield 20ga 2-3/4" Double Ball 5-pack What is Lightfield Ammunition Lightfield 20ga 2-3/4" Double Ball good for? The manufacturer says that it is best for self-defense.