With these two powders discontinued there are a few ball powder options but nothing that is a straight strike in comparison. HS-6 would have more energy or burn quicker of course, AA#7, Hodgdon Longshot, and then Ramshot true blue are other possible considerations. From those who have experience in trying to substitue for HS-7/Win 571 which powder gives the closes comparison for loading Ruger 45 colt/454 Casull loads. My most accurate load is 16.2 grains of HS-7; it is very reliable and consistent pushing 300 grain LFN PB boolits out at around 1,150 fps. Looking at burn rate charts, which means not a whole lot of beans, but true blue may be the closest...........any suggestions out there????