@strawCake - Yes, blunderbusses do sound fairly useless. However, I think they have a lot more style than many of our modern guns! I certainly can't imagine a pirate brandishing a modern handgun. It just wouldn't have the same effect!
That being said, the name "blunderbuss" is delightful, just as the article stated. I've never heard this term used to refer to a clumsy person, but I'm going to start using it. Maybe I can start a local trend.