Currently there are 10 native Telephoto Prime lenses for Sony A6300 and 7 of these lenses are autofocus (AF) type.
Sony A6300 doesn't have a sensor based image stabilization system but 1 of these Telephoto Prime lenses features optical image stabilization.
Since Sony A6300 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 6 Telephoto Prime lenses with Weather Sealings.