I like to shoot a bare minimum of 50 rounds, preferably 100, of the selected ammo to check for functioning (assuming a gun that I already have experience with, of course; if it's a new-to-me gun, I'll do basic function testing with cheap ball ammo before even bothering with the far more expensive defensive fodder!)
...If it's gun without adjustable sights, that means a) replace one of the sights with something higher/lower; b) if the point of impact is low, taking a file and removing metal from the front sight to bring the impact point up; or c) switch ammo to a different weight/velocity, then re-test.
...Bullet drop doesn't become a factor until you're considerably further away, and there's really no point in testing point-of-aim at long distances; 10 yards is more than enough to see if the ammunition is going where you want it to go.
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