Had an old fifty caliber flintock TC Renegade barrel rebored to .52 with 28" twist. It's the standard 26" Renegade length. Have a .515 round ball mold for plinking and various rifle bullet molds to paper patching to use with my .519 sizer. My percussion .52 with the 38" long barrel is making holes touch at 100 yards with a mid mounted pistol scope. The flinter is going to be used with a peep sight, in general a shorter range proposition. Looking forward to maybe tomorrow getting to try it out.
By the way, I have barrels he has relined, rebored and made. No complaints on any. On one he made me a fifty bore octagonal to round barrel for a small game critter getter that works the same as an extra light weight .410.