I toured the Stone brewery this week and based on the tour guide's comments, they must be asked about AB a lot. She told me personally that every tour includes someone asking for the recipe and that it's a mystery!
I didn't see any Special B but there was a lot of C150.
For the record, is there a practical difference in taste with C150 and Special B?
I ordered from Brewmasterswarehouse. THe grain stats are:
Special B: SRM 148 / SG 1.030
C150: SRM 150 / SG 1.035