It is possible to use 9mm rifles at 200m, but my strong advice from doing it here is not to approach this task by going to the range with Winchester USA, you need ammo that is more consistent than that, either top-of-the-line 9mm or handloads. I've done a fair bit of testing at 100m using different factory loads and the vast majority show serious vertical stringing at that range. Only Geco had concentric grouping from what I recall. Hmm, and CCI-Lawman I think, I'll have to check.
Most generic 9mm is really plinking ammo designed for the US market rather than target shooting quality ammo.
Obviously you have to be aware of your elevation, but that's the trade-off for not using something that is flat-shooting.
The problem we have here is that most ranges are only approved for pistol ammo (yes I'm aware of the irony), so most people use lever-actions in .357 or .44, but I've got a bolt-action 9mm, as semi-auto centrefire rifles are prohibited.
Plates should go down more successfully with 9mm as it has more mass than .223, even though they are both minor power factor.
The minor power factor was designed around .223 with a 55gr bullet out of a 16" barrel, btw, according to Tim Andersen, who wrote the rules.
Personally I like 9mm because it's more user-friendly, less muzzle blast/not as loud. Theoretically you will have more recoil (although it never feels like it) and muzzle flip than a .223, that might be an issue with semi-autos, but we can't have them here and it's not really an issue with a manually operated rifle.
