Bullets are kinda limited...I've found that 200gr Parker Hydra-cons have shot very well in my Knight Disc XT. Also PRBullets x-tended range. Actually, my knight is not a picky eater. XTP's worked well too. I generally shoot 200-250gr bullets. As for powder, find the charge that shoots most accurate. 80gr will kill a deer at 150 broadside. As for sabots, I too shoot the Harvsetors. Both regular and crush rib work well for me with no noticeable difference. The tan MMP are good too. I won't shoot the green ones from TC, load way too hard in both my 45's. I highly recommend the Parker H-C's, they are very accurate, open up well at longer ranges, and flat put it to a deer. Plus the folks there have shown me excellent customer service. Very fast shipping, too. I was sad to see that Traditions dropped them (marketed as the APB, and went to Shockwaves marketed as the Smackdown). Welcome to the world of 45's...we do it faster, flatter, longer!