Now, @aussie pete, make your square patches with the side of the square the same as the diameter of the round patches. Too large of a patch and the excess material can get caught in the loading jag and pull the ball off the powder. In either case what you have that is not covering the circumference of the ball is excess material. I have no objections to square patches over round patches or even cut at the muzzle as accuracy is going to be for all practical purposes the same.