Not offering it in the BDL is no surprise. The CDL was meant to replace the BDL which was dropped entirely for several years. They brought the BDL back, but in very limited production runs and in very limited chamberings.
I see no reason not to offer the 308 in CDL, but companies make what is selling. And they do offer it in the model 7 with a walnut stock. I guess most people who buy a 308 either want it in a smaller lighter package or in a tactical rifle. In a way that does make sense. If I were buying a full size and weight rifle I'd just as soon get a 30-06 and would prefer a 308 in a more compact rifle.