That' s a tough question, but it' s easier if you' re comparing button bucks to mature does. This method makes complete sense: A deer that is less than a year old (ie. a button buck), shows a " box-like" appearance, meaning that it is as tall as it is long (square-like). On the other hand, a deer that is one or two years old is longer than it is tall (rectangular). At short or long ranges, this is an easy rule of thumb and it is almost always reliable.

Jim