Lee
Every thing that Jagare says is correct!
Which is strange, because you would not expect such a group of ethical stylish individuals to also be so modest!
The combination is another option you might consider. Single rifle barrel under or over a shotgun barrel. Same benefits of compact dimensions and versatility - somewhat cheaper.
Disadvantage that is common to both Drilling or Combination ( BBF in German - Bochbuchsflinte ), if you fire more than four or five rounds without allowing the barrel to cool, the group will start to open up. The reality is that it is not a problem in normal usage.
This one is a BRNO 502 - there are still a few around and look quite nice as well as handling nicely.
The joy of either Drilling or Combi is that you still have the option of firing a slug in the shot barrel should you wish a fast handling double for driven big game. In my Sauer the left barrel is regulated to the rifle sights at 50m
You will find that the 'magic' comes back as soon as you enter a wood with an iron sighted combination. The sights are perfectly adequate for short range shooting in good light - the scope clicks back into place as soon as there is a need for a longer range capability. All of this comes together, the day you return home with a couple Rabbits, a brace of Pigeon and a Deer to show for your morning's excursion.
There is no feeling quite like it!
Rgds Ian