I've only had the mill for two days now. I used what I had available so no I haven't tried the Hard White and doubt that I will as we don't grown it in these parts.
To the best of my knowledge the only source for such a thing would be from Amazon and to be economically efficient I'd have to buy 40 -50 #'s at a time and I don't make that much bread. This is more or less just for fun. With that said, maybe in the future I might get more involved and give the hard white a go.