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"Has little or no bearing on projectile performance."
... or velocity. +P (etc.) only relates to pressure & has zip for relationship to velocity/performance. Do take a look at some various reloading manuals & you'll see that even by "lawyered down" stuff, some +p data actually gives lower velocities than standard pressure loadings.
Likely, you'll see a significant enough increase in velocity just by using the carbine length barrel. Plenty good enough & if not, maybe get something a step up that will.
9mm cartridge can go ballistic pretty quick. A fairly high-intenstity cartridge which belies its size ....
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