lagopus, many modern 8 gauge industrial hulls don't have a different size primer pocket, but they do have an extra layer of brass over the base and into the pocket that makes the pocket smaller and the base of the hull bigger to prevent those three ounce industrial boomers from being used in old duck guns. I don't ream out the primer pockets on my paper Winchesters, I just peel the second layer of brass away.