Questor - the Cor-Bon people will tell you right up front that you cannot duplicate their loads with cannister powders, and that is pure bullschmidt. They will tell you that they have special combinations of powders developed specifically for their use, and that is also pure bullschmidt. They use nothing more than commercially made powders and, I believe use rifle primers in place of the pistol primers. That may assist is gaining about another 100'/sec but does little for accuracy or pressure.
I compared two similar cases - one of their 400 Cor-Bons and the design they took it from, my own 40 Michaels. Other than having a shorter body and longer neck, which prevents the powder capacity I realized in my case design, they also use a small primer but even in properly chambered barrels, those rounds show high pressures. When looking at their 45 ACP loads, you can do just as well if not better with cannister powders and loading tables from the older Lyman manuals.
I wouldn't waste my $ on Cor-Bon ammo, and have asked friends not to purchase any for gifts for me. I'd rather roll my own. Well, actually, I do (LOL). Mikey.