Winchester Double X Ammunition 12 Gauge 3" Magnum 00 Buckshot 12 Pellets (5pk) Brand_Pro-Shot A plastic ball between the

A plastic ball between the wad and slug increases smoothbore accuracy

But in the 1920s

Simply load the plastic case with a large pistol primer

One 1/2 grain

Muzzle Velocity: 2250 fps

Winchester Double X Ammunition 12 Gauge 3" Magnum 00 Buckshot 12 Pellets (5pk) Brand_Pro-Shot A plastic ball between theWinchester's Double X Ammunition provides ultimate high velocity, knock down performance in the field. With copper plated hard buckshot for long range performance, Double X has been trusted by generations of hunters who demand quality and consistency. Features: Copper Plated Buckshot, Buffered Provides unmatched long range performance, tight patterns and maximum stopping power. High Velocity 1450 fps for maximum energy.