The Cream of Wheat could be used. And yes, the Wonderwad keeps the bore from leading up. I use a Wonderwad with a completely un-lubed Maxi Ball and get no leading at all. I use a Wonderwan with all flatbased conical bullets except Power belts, but don't generally use them with a PRB. The only time I tried a Wonderwad with a PRB was when I was testing T7 to see if it could be used with a PRB. I decided the answer was NO! I got high shots and blown patches with T7 PRB loads no matter what the load was, or if there was a Wonderwad on the powder or not.