As well as Hornady XTP's, I recommend trying the .44 cal 300gr, you may want to try Harvester's Scorpion PT Gold muzzleloader bullets. They come in 240, 260 and 300gr, .45 cal. I first read about them on this site.
My son shot his first deer last fall using a 300gr Scorpion PT Gold in a Harvester smooth black sabot, over 85gr of BH209. The deer only went 30yds. We've found in our rifles (CVA Wolf & Optima V2) that they shoot like SST's but hit lit XTP's! We like them enough that I don't mind paying the exchange and the shipping to order them from Kentucky up here to Nova Scotia! Great folks to deal with too.