I have one of the caplock types and it is plenty accurate. I installed a tang peep-sight and that's better for my old eyes. I always wanted the flintlock one (real Jeremiah Johnson stuff).
I mould my own balls. I use an aluminum Lee .490 RB mould with pure lead. I mic them out and re-throw any +/_ .004
link to mould: http://www.leeprecision.com/html/catalog/blackpow.html
Some people like the .495 ones because they say they are tighter in the bore. I would councel you to buy a box of both sizes and shoot them and decide for yourself before buying the mould. You might try conicals, too, but that link does not say what the rifling twist is. But this one will give some more info http://www.tcarms.com/assets/manuals/current/Shooting_TC_BlkPwdr_Guns_Man.pdf
All in all,you can't beat TC's warranty, and that thing will probably last forever, anyway. If you are careful of your load chain and keep the pan squeeky clean you should have no reliability problems.
I think one would be well served with that rifle.