RE: What steel shot size?
I hunt open water and small ponds with 3" 2's. 2's are the way to go for 30- yard shots. If shots are going to be further you might want to try 1's or even BB's. Don't be afraid of the 3". It doesn'tkick that bad and if you're not an experienced shooter the extra pellets may help. Also if you want to shoot a full choke you'll need to buy one just for steel shot. Factory full chokes that come with the gundon't handle steel shot. Try the modified for medium range birds. Take you're IC with you in case they are really close shots. Good luck.