Brass,
Those areas can be productive. Calls will not be effective however. This time of year bulls are not interested in their cows anymore. Your big bulls are going to be by themselves or with other bulls. I don't recommend using calls. A cow chirp may be a last resort but don't expect the bulls to come charging. Just stay quiet, hunt into the wind, and hope to get lucky. You never know when that big boy is going to be right ahead.

Good luck,
Chrome