'Til I fumble around trying to load a round ball on a precut patch , all sorts of mayhem might happen. Fairly sure I've shot many a ball down range w/ the sprue , off center. I recommend using a bullet board and a short starter. My hunting buddy , and talented antagonist on the competition ranges , used nothing but square cut patches , and won many a match with them. Long as the patch is the correct thickness , roughly centered sprue up ,or down , accuracy, shouldn't suffer. Consistency in the load , and loading of the gun , is what makes a m/l shoot with accuracy , shot to shot...........oldwood