I have been kind of fascinated with whole idea for a long time. Back when my 1st wife, Satan, and I were dating, she liked to go squirrel hunting. I offered to buy her a gun. She asked for a Savage in .410/22LR. I made the mistake of coming home with a 20 GA semi-auto. She never forgave me.
To this day, I'm trying to figure out what the lure of these 2-fers are. Few folks in my area have one. I mostly hunt turkey, deer, squirrel, and the occasional coyote. When I go out, I usually am carrying a single rifle or shotgun, and I am usually restricted by law as to what that can be.
As a for-instance, during turkey seasons, I have to have a shotgun bigger than 28 GA and shot size no larger than #4. During deer seasons, I can't have shot, only slug. I keep looking for a niche for 2-fer, but I am deuced if I can find one.
You guys are probably my best resource for asking the question: what makes a combination gun a good choice? What hunting situations? What game?
