Square patches work just fine. I like to cut mine so that they wrap almost 3/4 the way around the ball. If you make them much shorter, they may not engatge the lands and grooves of the bore properly. If you cut them much longer, they will tend to get caught on the jag on your rammer. You need to cover all of the ball that will be touching the bore but leave a spot on top of the ball that is uncovered. For example, for a .50 cal rifle, I like a patch that is about one and one quarter inches square. :thumbsup: