My experience ... NATO is pretty much right. A rub line usually indicates a frequented travel route. If scrapes developed along that same route, so much the better. But like NATO says .... no telling when the buck makes his trek. I have killed a few bucks working rub/scrape lines. And I have spent countless hours watching scrape/rub lines to no avail. And alas, I have 1000's of trail camera shots of bucks that made their trips only at night.