They can hit 7' but most stay 5-6.
Pituophis are great. They can have both a docile temperment and displays of hissing ,thrashing,puffing up and even an awesome tail rattle.
My little girl is an Albino Applegate Gopher. I think you said no morphs at the begining but she is a looker. Had her since she was very young. Now she is almost 2 and is about 4' long. She is a psyco feeder and has showered me with substrate striking her prey.
Very interesting snakes,not huge and generaly calm if you just open their enclosure and grab them without hesitation.