Winchester Field Trial Popper Loads were specifically designed for use in field trials and training exercises. Utilize the training benefits of the consistent shot to shot reports to get your bird dog to its absolute best. Popper Loads feature a cardboard disk and powder charge without any shot or wad. Can be lethal at close range, use under extreme caution. Notes:Perfect for training exercisesCardboard disk and burning powder are discharged from firearm's barrel when these blanks are fired. At close range, this discharge can be lethal. Use extreme caution.