Because it is a very low-power round, it cannot be used in an automatic shotgun; it does not produce enough recoil energy to cycle the next shot, causing the firearm to jam. An additional reason for use only in a manually-operated firearm is the fact that the round shoots at least a little flame for 3?5 seconds. This would cause a hazard if a shell still emitting flame were to be ejected from an automatic shotgun.
