Sorry, I missed that link you posted. The Gary book is much newer and detailed than the Albaugh books, which were great in their time. You will recoup the cost of the book by having that detailed knowledge before you purchase one pricey gun. Fred Edmunds was a true expert Confederate revolver collector and authenticator. Years ago while looking over a gun for me, he told me that he did a LOT of work on William Gary's book. So, that book was collaboration of experts. And you are already doing it right. As Lanyard Puller's byline says, "Your first purchase should be reference books." In the realm of Confederate pistols, truer words were never spoken.
Best of luck to you in your search.