how big is the turkeys head/neck area? i have 100 yard rifles sight in targets with a 1"circle that i patterned my gun with.(2-5 shots in the one inch circle at 35yards with a full chocke) is that about the size of a turkeys head? and do you guys know how to get a hold of an extra full choke tube for a browning invector+ shotgun? i see a bunch for the invector model but none for the invector+