I have some loads that will push a 265 cast swc to around 1,200 FPS, but 1,000 FPS is good enough for most situations. That'll do anything that needs doing in the lower 48. Bigger hole than the .44, more weight, and in and out performance is all that you can ask from any caliber.
You will really enjoy that gun. My stocks were made by forum member Kurac. He sells a lot of them here in the classifieds. They fit great, and once you get used to them (if your used to the Hogues on yours, or something similar) they feel great too. Mine are Cocobolo, but he makes them in Maple, Walnut, and maybe some other woods too.