I own an H&R slug gun myself that is very accurate and works well. However, my Dad is looking to get a new slug gun that is accurate out to 100 yards. The weapon he uses is an Remington 870 with smooth bore barrel that is pretty old and is not consistently accurate out to 100 yards. He likes the H&R, but he really would like to have something like a pump, semi-auto or bolt action slug gun so he can take multiple shots when needed; plus, he wants to get a good scope for this new weapon. Also, he wants to spend about 400 hundred on the gun and scope.
So my questions are, what are good slug guns that he can buy? What is a good scope for this kind of weapon? If you have any other suggestions for this, please say them.