Yes. For some reason the manufacturers often put their rifled slugs up in slightly shorter cases. Perhaps to make the unfired length the same as a 2 3/4 inch pie crimp shell for uniformity.
Even after they went to the pie crimps for most shells, they continued to put up the 16-gauge 2 9/16 inch shells with the rolled crimp. Westerns explanation
Super-X 16-gauge, 2 9-16 inch, Super Seal Cup Wads 01.jpg