Hey GreyBeard, I think scopes are allowed during the muzzleloader season.
If I understand it correctly, the only time when iron sights are required and scopes are not allowed, is on designated "Flintlock Hunts"....different from primitive weapons or muzzleloader (caps, 209, etc).
I don't want to mislead anyone, but I've read the posted regulations, and the best I can tell, flintlock hunts are the only ones where scopes aren't allowed. Primitive weapon hunts and muzzleloader seasons seem to be okay (note: I didn't look at the crossbow issue)
I think this one is definately worth a call to check on though. Sometimes it is hard to understand if it is allowed or not unless they specifically state it. If I've misunderstood this please call me out on it as I'd much rather be wrong here than wrong in hunting with a scope when I shouldn't.
You can find most of the regs at
http://www.outdooralabama.com/hunting/regulations/JCM