For the Mossburg pump an attachment can be bought to make it work with short shells, not so with a Remington pump. I think only the Mossburg pump will work with short shells. I've roll crimped quite a few over the years and have two boxes of them sitting in the window over in the clubs shotgun room. I even took apart a couple of boxes and shortened them up for the 2" shells. Some guys just can't figure out when Winchester or Remington made 2" shells and boxes for them.