I have a Knight Wolverine I got several years ago, and am very happy with it. I've had good luck shooting cast bullets such as Great Plains (385-460grn), and Hornady cast bullets, 420gr., and 80-110gr Pyrodex. I don't care much for sabots, but they are accurate; I just like throwing a heavy chunck of lead downrange. :shock:
The rifle doesn't handle hotter loads very well, I'm guessing due to both the slowish twist (1:28) with the heavier bullets and it's only a 20 or 22" barrel, so it may not be burning consistently. It does shoot 250gr sabots well with 120gr Pyrodex, though.