Extensive testing has been done with T 7 and Black Mag 3. These test have been very safe with compressed loads in both forms. The powder cans carry warnings the Rugar barrels carry a warning and the lawyers are happy. If you are more comfortable with these rules by all means follow all warnings.
Hawg, I can understand your lack of knowledge on shooting BP hand guns if you did not start until 1969. You are joking with me I am sure. You have to know the ROA is the winner more often in BP matches than the replicas. The exception being the Rogers & Spencer.
I would like to drop this diversion. WW Quantrill started this thread to discuss BP handguns. Please don't poison the well because of a personal dislikes. Thx DK