I like #2 steel for a couple reasons. Knockdown power, range and pass through. #3s are shine if the shooting is close or small ducks like teal are your focus. I just assume skip the #4s as the benefits of the larger sizes outweigh pellet count IMO.
Take the time to pattern you gun on a board with a variety of #2s and a couple chokes. You might be surprised at the density you can achieve when you find the right combo.
