Helice shooting — also known as ZZ and Electrocibles — is a particularly challenging shotgun sport. 12 bore shot-guns are the largest gauge permitted to be used. 28 grams /1 oz is the largest shot charge permitted. The small targets, called ZZ Birds, consist of a central “witness cap” equipped with winged plastic propellers on either side;the wings simulate the erratic, unpredictable flight of a live bird.