The test is a sop to the anti gunners
And thats all. Something that can be used to "prove" competence. There is no test that can prevent accidents, it is just something to make the process more complicated than it needs to be. Anything that makes it more difficult is good in the eyes of the anti-gunners. If they can't stop it outright, they try to make it as difficult as they can.
Many states have no test, no minimum range score, or anything like that. Just a pay the fee, fill out the forms, and (eventually) get your permit. Those states have no higher a rate of "accidents" than anywhere else, and lower than some.
The CCW permit does NOT make the holder into a law enforcement officer, in any way, shape, or form. It does not authorize you to go out and fight crime. All it does is give the gun owner a legal protection from prosecution for carrying a gun concealed.
All else being equal (and it almost never is) bigger bullets tend to work better.