Basic guideline for loading 9mm, .38 Super, .40, .45ACP, etc:
Set your seating die using a factory hardball round or a JHP that's as close to hardball shape as you can get.
Your OAL will always allow your loads to fit the mag. Your load's shape will always coincide with factory hardball well enough to feed in nearly any pistol.
There are exceptions to this. Some guns just won’t handle JHPs without modification. Super short/light bullets won't seat far enough in the case to stay secure.
It's a guideline, not holy writ.