With my mossberg 500 and a smooth bore it shot winchester rifled slugs fairly well. With the twin beads it was alright but not on center and no way to adjust it. You just had to compensate for it when you shot. I put some clamp on style fiber optic sights that go on the rib and things impmroved a little. I could prabably get 3 inch groups at 50 yards and it shot well enough I could take a deer at 65 or 70 yards, but that was my max with that gun. I only used it as a back up for my inline muzzle loader.

Now I have a buddy that has a fiocci (spelling?) auto in 20 guage that will shoot well enough out to 90 yards to take a deer. And that is with beads. However this gun is so light it beats the crap out of you when you shoot it. Every gun is a bit different.

The right ammo out of a rifled slug gun is a WORLD of difference. Yesterday I shot some of the same ammo in my H&R that I used in my Mossberg and it shot better at 100 yards than the mossberg did at 30. 1 ounce rifled slugs at 1760 fps. 2 bucks a box! Makes a mess in your barrel, but the difference in accuracy between a good rifled barrel with a scope and a smooth bore is pretty impressive. And then if you find a good premium sabot load the are even more consistant and cleaner to shoot. However they over twice the money.

Another thing to consider in accuracy is if you are using a pump or something with a removable barrel, don't mount the sights to the reciever. It will not be very consistant most of the time. And if you pull the barrel to clean it you will most likely need to re-sight in.

I say if you are going to do close up stuff and take fast shots, a smooth bore pump or auto can work pretty well. But if you are looking for longer ranges and precision shots, a good rifled barrel is the way to go for sure.

Just my opinions any way.

Paul