My Dad was a Benchrest Shooter. He shot 22PPC, 6PPC and 22Waldog. I have a few pounds of powder of his that was popular with benchers shooters in the 1980-1990's. I do know the it is probably a surplus powder of some kind as my Dad had it stored in empty Win 748/760 cans. He removed the WIN labels and the cans are clearly labeled BR #28. I have unable to find any info on the powder, Does anyone have any information on powder?