I heard that the wider tracks (2" or wider) and 3" long tend to be that of a Mature buck... I have harvested 3 what I call Mature bucks and this all proved to be true... as I like to do some testing of my own to see if all that I read and hear is true... I have also heard that the clumped droppings tend to be that of a mature buck... I have no proof or theory of that, but due to the fact that the deer in one givin area all tend to be eating the same things at certain times of the year, and there are different droppings (clumped and not clumped) I would say there could be some truth to that as well. But who really knows... Just look for the big ones and hold it on the front shoulder...
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