I could most likely hit my .355's with a lightweight hammer and not set them back again. All of that to say that with the true 9mm die you should get a good amount of neck pressure. There was a tremendous discussion on below a long time back about this, https://andersonpakud.theblogfairy.com/35882299/the-single-best-strategy-to-use-for-9mm-bullets-for-reloading