I have a Winchester 1200 that I use for any gun hunting I do. It will hit a milk jug every time at 100 yards and has consistently been reliable on deer at ranges out to 93 yards--hit right where I was aiming and dropped the deer in it's tracks. It's an off-the-shelf smoothbore with screw-in chokes.

That said, slug guns are a short-range gun. They're better today than they used to be and I believe that--with work--4-5" groups at 100 yards are attainable with the right load combinations for most modern shotguns. Smoothbores will have less accuracy than rifled barrels will and should be thoroughly tested and practiced before determining your effective range.

Today's small bucks are tomorrow's trophies.