If you have a shotgun buy a variety of 00 buck for example. They can be found in five shot boxes. Buy 3 or more brands etc. Then pattern the gun at 20 or 25 yards and see for yourself the incredible variation. It works the same way with slugs.
Some guns prefer one brand over the other.
It can make an incredible difference. But at 25 yards it is off the paper most of the time. The same gun will shoot another brand of buckshot like a rifle at room range and have only an 18-inch pattern at 25 yards. Few shooters understand the fickle behavior of the shotgun with various loads. When it comes to any serious concern of liability, the shotgun again is king.