I could most likely hit my .355's with a light hammer and never established them again. All of that to express that using an real 9mm die you should get an abundance of neck tension. The underneath pics and facts are from a super in-depth post from Blessed Gunner in https://9mmbulletcasing98640.madmouseblog.com/18239913/the-single-best-strategy-to-use-for-9mm-once-fired-brass