The recipe came from Jamil Zainasheff and John Palmer's book Brewing Classic Styles (pg 164). In the book, JZ states "This is a classic dry stout recipe. It makes a great dry stout, but you need to crush the roasted barley very fine. Run it through a coffee mill or use a rolling pin to turn it almost to dust. That is critical to getting the right flavor and color with this recipe." That is all he says. I guess we will have to see how it turns out.