Is your head swimming yet? The problem here is solutions are vast and almost all are viable. This thing is that loose when it comes to what works. Each rifle is different as to what it prefers but in my mind muzzleloaders are kind of like touring Harley Davidson motorcycles... how do you plan on using it? Specifically, at what maximum range do you foresee your targets being? If you're in dense woods and no shot goes beyond 50 yards then there's that. You get where I'm going here. I can yell you this. There have been more deer harvested with 240gr Hornady XTPs than all others combined. They buck brush and they kill deer. Powder and primers are secondary. Pick a bullet and find a load that provides accuracy that you're comfortable with.
That's the short answer.