Depends on firearm. It makes a big difference when using pump, vs semi-auto vs lever action,.... When it comes to handguns of similar caliber/power it makes no difference. I pick any and shoot good group with single cylinder or single magazine. Unless one is competitive shooter where timing is important reloading speed is of no significance to typical civilian user.What the heck?
You're expecting someone with little firearms experience, who's just bought his first four guns, to become a proficient shot in "a box or two" of ammo (with multiple guns, even)?
Your standards must be ... plutonic.