What does opening the choke on superposed do to the value?

Opening the choke on a superposed (or double-barreled) shotgun increases the spread of the shot as it exits the barrels. This means the pattern of pellets will be wider, making it easier to hit moving targets at close range. However, it may reduce accuracy for longer distances since the shot is dispersed over a larger area. Overall, it adjusts the shotgun's effectiveness based on the shooting scenario.