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I haven't looked at the specs yet, but I reload all of my center fire cartridges. The 9mm is not a straight walled brass casing. It is slightly tapered. The straight wall cases e.g. 45Auto, 40S&W, 10mm are easier to reload and consistently headspace on the case mouth. It makes them usable in a revolver cylinder without need of "moon clips". The flaring and crimping of the case mouth is easier with a straight wall.

Let's see how this plays out. The ubiquitous nature of 9mm lead to high quality and choice in suppliers. Bringing out a new caliber risks being an orphan. I found a very nice Tanfoglio 1911 pattern pistol at a local pawn shop. It had been there for a couple months. A trip to Sportsmanswarehouse was revealing. The pistol was chambered in 38 Super. There was exactly ONE box of ammo from a single supplier. No thanks. I'm already smarting from the 5.7x28 supply shortage.

I'm waiting on my LGS to notify me when the S&W M&P 2.0 4.6" 10mm arrives.

...I reload all of my center fire cartridges. The 9mm is not a straight walled brass casing. It is slightly tapered. The straight wall cases e.g. 45Auto, 40S&W, 10mm are easier to reload and consistently headspace on the case mouth...

If you reload AND prefer straight wall cases, you would probably like .38 Super. You can load it up to higher energy levels than the 9x19, or load it down to match the .38 ACP. Plus, the larger case can safely handle heavier bullets than the 9x19...

I’m a big fan of .38 Super, during the first ammo frenzy I scoured Albuquerque and found a shop that was sitting on 4000 rounds of it. Offered them $15 a box for the lot. I’m set. Did the same with 16 gauge buckshot and slugs. Those had been around so long most were $2 per box of 5. Stocked up on .300 Savage too. Yeah, I’m weird.