Congrats on the hit, every once in a while one will get away on a guy. I use a lot bigger shot than #4s when shooting ducks. If I were you I may step up to a BB and when shooting steel remember that speed kills, 1550fps works the best on waterfowl.
I shoot 3.5" Kent BB at 1625fps, that smacks a bird, hard.
I shoot 3.5" Kent BB at 1625fps, that smacks a bird, hard.