Back in the day (1980s) Nato (some or most)military 9mm was loaded hot to run sub-machine guns.... this was linked to the SEALS having locking block issues with early Beretta 92s.

For a family heirloom I'd stick to standard commercial ammo.......lots of good hollow point defense ammo..... remember shot placement is king. And lots of cheap FMJ at Wally's World.

Good excuse to grab another gun .... maybe a 3rd Gen 5906 or even..... dare I say it ......an M&P!!!!!!