AA3100
I know in many calibers H4831 is a similar and suitable powder. In the one and only load that I use AA3100 for I have not been able to duplicate the accuracy with any other powders (yet).
I know it is not the most efficient, powerful or highest velocity load but........ 50 grains of AA3100 in 45-70 Starline brass , CCI large rifle magnum primers and a 510 grains round nose Govt bullet is very accurate out to at least 500 meters in my Pedersoli Quigley Sharps. I still have 3+ pounds left. It will be a sad day when I run out. Then the load development starts.