Supposedly a New Ithaca Double (they were well regarded in years past) was at point the "model". Read that somewhere years ago. It might even be true. Shrug.

If you notice the size of the pellets that Elmer had flying, he seemed to almost always be using buckshot. Of course since he was chasing a talking, and sometimes cross dressing, rabbit that was taller than he was, I suppose that was for the best.

In reality, Elmer simply had a terrible Absinthe habit that he'd picked up in the trenches during Dubya Dubya Wun. This also lead to his speech impediment. Bugs was simply a figment of his drug induced hallucinations.