Noting. I feed my Benelli's estates and have for a long time. Use the stock IC choke. Maybe I'm weird.
Not at all. For my money, estates are the best of the "economy" grade steel shot. And I shoot them most of the time. 3" number 3s for early woodies, switch to 3 " 2s when bigger puddlers come into the mix. 3-1/2" BBBs for geese. Late season all around load for geese, divers and puddlers is 3-1/2 inch 1s