Flame, the Coosa strain has now been identified as a
separate species of black bass.
Under the right conditions they do get large. There may be other regional strains that also achieve large sizes. Our member Nathan&Kelly has some very remarkable examples in his pond that exceed 7 lbs. They could be Alabama bass but given the age of his pond in Missouri, I would place my money on them being sourced from Missouri and for these particular specimens, I would say that their growth reflects favorable conditions for growth through out their life.