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The amount you expand the case mouth is also dependant on what type of bullet you are loading. If you are loading lead bullets (unlikely since you said 9mm) it is advisable to open the mouth a little more so you don't shave lead when seating the bullet. I have my expansion die set as described by LT, you can easily feed the bullet into mouth of case (but it won't drop to bottom of case when you let go of it)