He may not be mature but with those short tines, he's never going to score real well. I say shoot him, if you like him. And I agree he's probably somewhere around 19-20 inches inside.
That makes absolutely no since at all...
He is young but has short tines??? How about, he has short tines "because" he is young.
He will never score well??? He is young, there is no tellin the possibilities of what he will be til he is at least 4 years old. His tines could triple in length in 2 years. Not to mention he would probably be even wider than he already is!