Hi Peyman,

Rifled barrels are not designed to shoot "shot". As someone else already pointed out the rifling departs spin to the "shot cup" and as the shot exits the barrel it is essentially flung in a big spiral. It will not pattern well.

You need a smoothbore barrel for shooting shot. (And chokes are a completely different issue as well).

But to answer some other questions. A "sabot slug" is an underbore sized projectile that is fitted in either a plastic cup or plastic sleeves. The plastic cup or sleeves engage the rifling in the barrel and impart the spin to the projectile. Shortly after departing the muzzle the plastic falls away from the projectile, which is now spin stabilized, and on its way downrange. The stabilization of the slug is what contributes to the accuracy. The reason most sabots "shoot flatter" than full bore sized slugs is several faceted. One...they tend to be more aerodynamic. Two...they sometimes, (though not always), weigh less than a full bore sized slug. And three...they frequently, (though not always again), start at a higher muzzle velocity. All of these can contribute in flatter trajectory....and longer ranges. They will usually shoot better in a rifled barrel than other types of slugs.

Now having said that....let me say this. There are currently several manufacturers that make full bore sized slugs that are designed to shoot well in a rifled barrel. These slugs will be so marked on the box....."Rifled barrel only". So if you are so inclined....have the money...and have the time...you might want to give them a try as well.

Any how....best of luck!

Dave

P.S. I also forgot to mention earlier. Rifle sights work fine for shot....if they are installed on a smoothbore barrel. I know many turkey hunters that like them for that reason. And they also work with Buckshot patterns from smoothbore. And one of the best bunny/grouse guns I ever had was an 18 1/2" barreled smoothbore with rifle sights and choked "cylinder bore" (which means no choke at all).