I don't what kind of money you are talking about, but I wouldn't want a single shot slug gun for waterfowling. Maybe a Remington 870 would be you best bet since you can buy a two barrel set which would include a rifled slug barrel for deer hunting and smooth bore choked barrel for any other types of shotgun hunting you would want to use it for. As far as the pros and cons of rifled slug barrel I guess they are suppose to be more accurate than a smooth bore at a longer distance. You might consider a shotgun scope for the slug barrel also. Good luck and happy hunting.