Frick em, I use my 870Express, and 2-3/4" factory fodder (just pattern it first) regular price steel loads on ducks all the time, wait till there in range and if it patterns decently you will bring the birds to bag. FWIW:I shoot my fair share of geese with 2-3/4" 1-1/8OZ #2 steel 1450fps, no problem, again decoy better, get em close and make sure it patterns.