***Go back to the drawing board and learn how to hold and shoot a gun properly because what you just stated in your post is not correct! A gun should be held firmly into the shoulder and not be allowed to jump all over the place like it has to be doing if you shoot the way you describe. When you are shooting slugs you are shooting the gun like you would a rifle and need proper breath control along with several other things just like trying to shoot good groups with a rifle. Your statement about a 28" barrel would probably be true since most shotgun barrels designed for small game were that length and some were even 30". It could also be the fact that the choke in that particular shotgun is too tight. Most rifled slugs are shot best through an open choke and normally will not shoot good in chokes any tighter than modified for the most part. A difference in chokes may have been the difference in one member stating that the same two guns he and a relative had shot slugs differently. What is the choke in that old gun you had problems with?