Visually there is not a lot of difference in the various loaded 28-gauge shells --
28-gauge Super-X with 2 1-2-inch Remington Shur Shot.jpg
From left to right --
1. Remington Shur Shot 2 1/2-inch, roll crimp, loaded length 2.357-inch
2. Western Super-X 2 7/8-inch, roll crimp, loaded length 2.612-inch
3. Western Super-X 2 7/8-inch, Super Seal crimp, loaded length 2.495-inch
4. Western Super-X 2 3/4-inch, Super Seal crimp, loaded length 2.425-inch