I have taken two classes on shooting into, out of, through, over, under, and around cars. The only guarantee about bullets and cars is that there is no guarantee. I have seen .22s zip right through while 12 gauge slugs got stopped. It all depends on what the bullet encounters as it goes through the car. Since we can’t really control what happens to the bullet after it first hits the car, we can’t control what it will hit.
So, the rule for shooting into or out of cars, is P for Plenty. Use plenty of ammo and hope for the best.