Cream of Wheat is cheaper, by far
I.M.O., Two things here. First, any quick shotgun powder will work. Second, you want the 1/4 case full of Cream of Wheat held back against the small powder charge, so it "blows forward" into the shoulder or neck. You are substituting kinetic energy for several thousand lbs. of pressure.
Rimmed cases seem to work fine. Rimless, not so fine. You still have to come up with something to head space the case on. False shoulders are O.K., and so is jamming a bullet into the lands, over a high power powder charge. My 44 x 356BB won't completely form out, but I finish the job with my expander button. Something to consider is that this also hardens the necks in a hurry.
Someone might lose half his barrel's life, by shooting fire forming bullets to make his cases out of. So I try the Cream of Wheat drill, whenever I can. I use a 5 gallon plastic bucket lined, and with top and bottom, using carpet scraps. A small hole lets me stick my muzzles into the bucket and through the top lining. Within reason, in my garage, I can fire form a couple of dozen cases, without attracting unwanted attention. Some modern cases are really tough to work with, in these ways, just as some are getting really hard to find, anywhere. I had to polish up on my case neck annealings, for some of my newbies.