> You either need a huge shotgun (a "puntgun")
Where does that come from? Duck hunting is a pretty common sport, and punt guns have gone extinct since about a century now. I'm surprised you even know about them. As Jake said, they were the (clumsy) solution to technological limits of the 19th century.
Common ducks are definitely not armored, and hunting shotshells are sold with different sizes of shot inside, from tiny birdshot (you guessed it, for small birds) to much bigger buckshot (yes). You pick the one fitting the game you're hunting; If you use buckshot against birds you'll have to search a while to find some meat shreds, if you use birdshot against a buck you'll just annoy it.
Biting the hand that feeds IT
