TC Renegade

T/C traditional rifles (flintlocks and caplocks) are very well made, durable, and generally quite accurate with both RB's and Maxi-Balls.  Although the 1:48” twist is a compromise, I've never had a problem with it and RB's.  However, some T/C bbl.'s are more sensitive to patch thickness than others and that will have a significant effect on accuracy.  I'd start with the RB diameter T/C recommends*, or better yet, one of their molds in the appropriate caliber and use T/C patches or .014” - .015” pillow ticking (compressed) if you have it.  That combination with a reasonable charge (70grs.) of FFg or Pyrodex RS should allow you to put at least 3 shots touching from a rest at 50 yds.  If not, try .018” pillow ticking (compressed) with the same RB.  Use a good BP patch lube, e.g., T/C “Bore Butter” (can also be used on Maxi-Balls) and dry swab the bore after seating the projectile atop the powder charge, but BEFORE capping the piece.  Damp swab, then dry swab after firing a Maxi-Ball and again after seating it (but before capping it).  This is for target purposes.  When hunting, you wouldn't necessarily swab so often.  Once you're satisfied with the rifle's accuracy, you can experiment with other patch lubes including those you make yourself. 

*You can also purchase Hornady or Speer swaged RB's of the appropriate diameter for your rifle if you prefer not to cast them.  Btw, if you opt to cast, weigh a sample to determine the mean weight and standard deviation and use that data to cull your “droppings."  It DOES make a difference in accuracy.