Thread: Between eyes or ears

Was asked tonight to drop a pet pig as it is showing signs of old age and owner needs it to be done humanely as leased land from council. It is a big old thing and will probably be dumped down offal pit
22 is out of the equation yet to decide if it will be .308 6.5x55 or 7.62x39

Anyway is it best between eyes, between ears or imaginary lines crossing from eyes to ears?
Have not done one this close and would rather give it an 80m head start but that won't happen