I've run fescue through the large seed box on a CaseIH drill, and I used the seeding rate from a Great Plains drill to do it, does that count? If you can find a rate chart off of one of their conservation drills that have the 3 seed boxes, they have a rate chart for fescue through the regular box. Compare it to, say, the wheat or soybean setting on your drill to get a comparable rate.