That barrel can and does shoot round ball very well with a tight fitting patch.
If you want to shoot minie bullets through it, the minies should be sized .001" under size for best results. Loads greater than 70 grains will blow out the skirts on a minie ball.
To stay at the range for a longer time shooting, you should damp swab between shots.
If not the bore will crud up, giving poor accuracy, and greater difficulty in loading.
You have a good start on a plains rifle should you wish. You can hunt ground hogs( if you hunt ground hogs, if you miss, you make a great NEW hog hole) to T-Rex with that puppy.
Not many appreciate this type of barrel, but they do shoot very well.
Fred