A "10-point buck" describes the size of a deer's antlers, not its height and weight. Antler size is determined by a deer's age, nutrition and genetics. However, some yearlings with ample food supplies are able to grow impressive eight-point racks.
Antlers typically begin growing in April as the bucks experience more sunlight. During their growth period, antlers are spongy and covered by tissue, which is referred to as "velvet." After four months, antlers are fully formed. During fall, they completely harden. Antlers are shed between December and March, after breeding season has finished. Each side of the antler drops off individually, so, for a while, a buck has an antler on only one side of its head.