Thanks for all the comments on the powders from you guys.
Johnn Peterson once sent me the Aug-Sept, 2007 issue of Handloader magazine. This issue reports on a tremendous amount of testing, of many different bullets, powders and pressure ranges, for the 1895 marlin 45-70.
Brian Pearce, the tester, states that among his favourite accuracy powders are, H322, H4895, Varget and H4198. These are all Hodgdon powders, but I don't think he is biased, as he has good words for several others.