Really nice thing is that if you have the equipment, you can load the 9mm LARGO (aka 9mm Bergmann-Bayard, aka 9x23) AND the 9x19 (aka 9mm NATO, aka 9mm Parabellum, aka 9mm Luger) with the same dies!
The only differences are that the cartridges are different lengths: 19mm for the Luger, 23mm for the Largo (DESTROYER). The extra 4mm of case length lets you pour in a bit more powder and still keep the pressures more-or-less rational.
You end up with pistol ammunition suited to your pistol and CARBINE ammunition which will make the little DESTROYER perform the way it should: hit harder than the pistol round and at longer ranges. ADD to that the velocity boost you get from the longer barrel and you really have something.
I once chrono'd my 1911 Colt and my Reising Model 50 with ammo from the same box. Reising got better than 200 ft/sec more velocity, which made for about 40% more power with the 225 slugs I was using. The Reising could do things at 100 and even farther that you couldn't even THINK about with the Colt.
You have the same situation here with the DESTROYER but even moreso: the Largo cartridge is considerably more power than the Luger round, just to start off with. The long barrel on the DESTROYER gives you yet MORE advantage and, if you use proper ammo, the thing will be throated correctly and MUCH more accurate. That's why I went to the little bit of trouble to get 9x23 brass for my friend's DESTROYER: so we could cook up handloads which get the most out of the little rifle in every way.
We're having a lot of fun at this. You can, too!