well im kind of new at this turkey hunting but if you were to look at a turkey target with a turkey head as the target itself it would be a life size picture. one inch i think is a little small but your also aiming at the neck as well where one inch would be bout right as far as your gun i cant help you i cant see why invector choke wouldnt fit unless you know something im not aware of i would try one if it dont fit take it back or call a gunsmith