Congratulations on taking the spike.. say what they will but horns never tasted as good as the tender loins.
You picked a great rifle and I am sure it is going to give you years of service. It also sounds like the black powder bug is under your skin. Like many of us, we use them even in the modern season. I really see no disadvantage since one shot is usually all I ever get and I work to make that good...
Good luck with the rifle and scope...