All waterfowl I use the Carlson extra full steel. I either hit them hard or miss clean. There is no in between. Lot less cripples. I get a little more range out of this choke tube also, but the main reason is the hit or miss.
What are some of your favorite choke tubes to use for Ducks and Pheasants?
Lead or steel shot or copper coated? I have an over/under and generally like 3″ 3 steel for most pheasant situations so I use a IM in the first barrel and a M in the other.
I use patternmaster in my Benelli. I like the code black duck for duck hunting and use the extended range patternmaster on snows. If I were to use just the plain tubes, I stick to modified for all steel shot and for the specialty shot like blackcloud. You still have to be a good shot for everything to work right though.