A good rule of thumb is to never shoot an anterless deer that's traveling by itself unless you have a really good look at it's head through a scope or binos and are sure it's not a buttonhead. A lot of solo anterless deer are button bucks because they have been run off by mama as the rut hits, they're wandering around solo until they can hook up with some other group. I prefer to shoot does that are traveling with fawns, then there's no doubt that I'm shooting a mature doe.