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There is great ammo and truly substandard ammo. Which are you speaking of, specifically? (make/model of specific round)
That said, in 9mm calibration I typically use Remington/UMC FMJ range rounds and either Remington Golden Saber, Federal HydraShok or CorBon JHP rounds. The Federals seem to be the most accurate, most consistent over time. But the difference are largely kick/recoil due to the power loading, smoke due to how clean the powder is. POA is pretty much unaffected, in my experience.
Now, get some shoddy makes, or some poor hand loads, or perhaps some of the cheap manufactured rounds and there may be some minor differences.
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Your best weapon is your brain. Don't leave home without it. 
Reports: CZ P01 pt1, pt2.
Thoughts: Justifiable self defense.
Explain: How does disarming victims reduce the number of victims?
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