I think the bottom line is that you CAN use Blue Dot once again, with their newer data. Go to their on-line load data and check what they list. All their data has been re-tested and confirmed to be good with current-production powder. Just don't expect it to work as well or should I say "get as high velocity" as the old Blue Dot.
However they still do not list any 41 Mag or 125gr-357 mag loads.