Used steel in the wma's in the Dakotas and 3's or 2's work fine. Remember the pattern will tighten, too, and it seems, like with ducks, you might get a few more delayed deaths since the steel doesn't deform like lead, so keep an eye on them even as they sail over the next field. Sometimes they'll fade and the pooch can make a 300 yard retrieve! Steel is lighter so gets to the bird faster but slows down faster at distance , so for the most part, on the regular shots you won't notice much difference, the longer shots maybe a little less oomph hitting the bird.
