Well IMO it's too bad you purchased those pellets. Loose powder is really the best way to go. A relatively inexpensive but accurate bullet is the Hornady XTP. But get something in the 250 to 300 gr range. And you can buy Harvester or MMP sabots separately. I like Harvester CR sabots (CR stands for crush rib).
Black for 45 cal bullets and green for 44 cal.
See my thread on the CVA Accura. Good luck