I'm here to tell you a patched round ball and a load of shot will NOT shoot to the same POI.
I tried that years ago with a 61 cal musket. The round ball was so far off to be completely out of the question as a usable item. The shot tended to be very near POA.
Too cheap, Hellgate? Just pretend a flight of doves just went past. 10 rounds goes just like that.