I once used a bolt-action Mossberg without the magazine (lost it) to get three teal with two shots. I was hiding behind a tree and tall grass beside a beaver pond and three teal swam up without my seeing them. Peeking over the high grass, I saw them swimming about 25 yards out.
Having only a single-shot at that point, I lined two of the ducks up and shot them, then, with the next round wedged between the middle two fingers of my right hand, loaded that round and shot the third as it flew to my right, about 30 yards away.