we have cars from previous law suits all over our yard and weve shot the crap out of them with everything from 22's to 45-70. all will easily go through a car and whats remarkable is how the .22 will leave a dime size hole through both driver and passenger side doors if if shot within 25 yards from the side of the car. Engine blocks are another thing though. Most bullets around .270 or larger do some good damage to the side of the engine block but most of them do not go completelty throgh the engine until it has been literally shot to heck nultiple times. the metal on the doors is usually 3/32nds of an inch which isnt gonne stop anything bigger than a bb gun so dont let the thought of "the bullet went through a car" get over emphasized.A two inch thick shoulder bone has considerably more stopping power than the metalused to manufacture most fenders and firewalls on modern vehicles.