I've never carried anything but a 20 ga. for pheasants, usually with #6 shot.
I've been carrying an Ithaca M37 choked IC for years, but recently found my "holy grail", a 1960 Superposed in 20 ga., so I'm anxiously awaiting the season opener this year.
You're going to love toting' that new Citori this Fall! Enjoy.
Jeff