I do the hang test and it works most of the time. Hold the chick gently and let the feet hang down. Let it relax and lean it back and if the the legs stay down it's usually a pullet. If the legs draw up like it's scared to fall then it's a cockeral. Not 100% but it does work a good bit of the...
That picture is about 2 years old. She was was only 2 at the time. Ruby is a Ideal Hatchery Buckeye and although she doesn't lay the biggest eggs by far she has a great personality.