Like said before, a small buck cant make a big rub, but big bucks will also make rubs on small diameter trees, so if you find a rub on a big tree you can be sure that a nice buck made it. As for scrapes, if you find a huge scrape it is most likely a community scrape that several bucks are working, or if the licking branch is big and spread out the buck may be pawing all around under it, which makes the scrape bigger. Theonly way you can somewhat guess the size of the deer that made a scrape is by finding a track in the scrape, if there is a big track inthe scrapethen chances are a big buck visited it. If deer are still visiting the scrape right now I would get a camera over it just to see what it is. There was a scrape on a property that I hunt that bucks were checking outin january last year and I got a few nice pics on my camera I put on it.