The best powder for your rifle is the stuff that fits your shooting style and budget. If I recall from your first thread Triple Se7en is easy to come by where you live and is sold at a good price. I would buy the loose FFF equevelent and start around 100g and work up from there. DO NOT EXCEED 125g of loose T7 it is more powerfull than Pyrodex or black powder.

Keep saboted .44cal bullets over 240g and .45 over 250g and you should have good results. Encores are not that picky what you stuff down the bore.