The old standards were IMR-3031, BLC2, W748, ect. RE-15 seems to be working pretty well for a lot of guys nowadays, some are using Varget and are happy with it. Many look forward to the new Hornady Leverevolution powder that is supposed to offer more velocity than previously could be attained... that remains to be seen I guess. Anyway, there is a ton of .30-30 data out there. Great old cartridge!