Personally, I wouldn't. Test out as many different ammo types to see what is most accurate in the rifle. Think about getting into reloading and making more accurate ammo for the rifle.
If you need more accuracy than that, consider buying something more accurate to start with.
Most SKS rifles I have shot in the past, had very acceptable accuracy on man-sized targets at 100 yards, using open sights. Pretty much what the rifle was designed for. It was battle rifle, not a target rifle.