A D-Class competitor can tighten up one notch to Improved Cylinder, and so on, until you get to Master Class, where you screw in an Improved Modified. Master Class shooters have the ability to take advantage of the tight choke on long targets, and also the ability to hit with a much smaller pattern at close range. Most of the top shooters do use a lot of choke because they have the skill to use it. Incidentally, so does one of the best wingshots I know. He shoots Improved Modified at everything from doves and teal to Canada geese. He can make the long shots and head-shoot birds up close, too, so it’s the right choice for him, if not for most of us.