Daniel, you don't want to shoot steel through that choke that has written on it "NO STEEL", because it may cause damage to your shotgun. If you can buy/order from Cabela's.com, then you can get choke's that are steel specific, and you can shoot lead, steel, or any of the alternative shots through them.
Which shot to use really does depend on your billfold, because I'd suggest using the alternative to steel shells that have tungsten/heavy shot. IF you can use them and afford them, then you can drop down in size in shot, when compared to steel
For instance, for pass shooting geese at long range, you'd probably want to use T shot steel but you can drop down to maybe BB or B shot or even 2 shot in tungsten or heavy shot. Reason being that steel looses it's velocity quicker because it's not as dense as heavy shot and it just doesn't penetrate as well as heavy shot.
Since your gun can use 3" shells, stick with them for your waterfowl hunting. Brand of shell really doesn't matter.