Re: cream of wheat?
A google search would probably produce better answers, but my understanding is that you put a charge (I have no idea how much) of a shotgun or pistol powder into your case and then fill the rest of the case up with cream of wheat as a "filler".
When you pull the trigger, the cream of wheat will provide resistance for the gunpowder and allow the gasses to form the case to your chamber. The reasoning behind the cream of wheat method is that you can fireform brass at your house without wearing your barrel out because you're not shooting bullets. I have no idea the validity of any of the above information, but it's what I've gathered from reading various threads on the subject.