First off I just think I should say I'd go flint or caplock for your first BP rifle(I'm not much of an inline guy). That doesn't mean you shouldn't go inline. I'm just old school.
I do think .50 cal is a good all around caliber in terms of cost vs fire power vs accuracy. Can't go wrong there.
I also own 8 CVA's, both rifles and pistols. The only ML's I own that will out shoot them are custom made with Green Mountain barrels and they cost substantially more. CVA's not a bad choice.
The number one cause of death in the 20th century. 290,000,000 citizens were first disarmed and then murdered by their own governments. This number does not include those killed in war.
We're from the government, we're here to help