He already has the 2-barrel gun. Some folks don't like the pumping part. I recently wrote a chapter on guns for a new grouse book. ("A Passion for Grouse"). Looking at statistics from the Loyal Order of Dedicated Grouse Hunters (LODGH) concerning preference by gun type, early 1980's vs early 20-teens, pumps have dropped off significantly in popularity. As you point out, the problem isn't necessarily weight. The Ithaca English Ultra 37 weighed something under 5#, I believe . . . for those who can shoot a gun that light. But pumps just aren't as popular as they used to be.
Depending on hunting type I would expect semi-autos and over/under shotguns to be most popular. What I was trying to get at is having nearly identical or identical choke in both barrel of double gun is kind of pointless just like having single trigger instead of two. He would be very well served with Beretta 3xx series, Benelli or Franchi semi-auto.
