I question your tactics and target. The little training that I have on anti-carjacking tactics is to bring the gun above the metal part of the door in the Center Axis Relock. A right-handed shooter can shoot over the metal one-handed, if shooting to the right.
I'd say switch to a good 357 SIG round if you are in and around automobiles.
Massad Ayoob says:
Secret Service (with SIG P-229s) and North Carolina Highway Patrol (with Beretta Cougars) both adopted the [125gr] Winchester Ranger Talon round, but neither has had enough shootings to develop a data base. Departments like Virginia State Police (SIG P-229), Richmond, VA PD (Sig Pro), and Texas Department of Public Safety (SIG P-226) have all had numerous shootings using 125-grain CCI Speer Gold Dot. And all have been uniformly thrilled at the results. [
]Recommendations for five calibers based on street performance - Duty Loads: Today's Best - page 2 | Guns Magazine
and
From Texas to Virginia, [the 125gr JHP Gold Dot] has been kicking butt with no horror stories of stopping failures. New Mexico State Troopers fell in love with the 357 SIG a few years ago, and stayed with that cartridge when they ordered their new S&W M&P auto pistols. North Carolina Highway Patrol gave up its beloved Beretta pistols after more than twenty years to adopt the SIG-Sauer, because they could get it chambered for 357 SIG.
Gunfights indicate that this cartridge is particularly good for shooting through auto sheet metal and window glass, yet does not deliver on the street the dangerous over penetration that some gelatin tests had indicated might happen. The spent, expanded bullets are normally recovered from the far side of the criminal’s body, or from his clothing, or from the ground within a few feet behind where he was located when shot.
Massad Ayoob.
The Gun Digest Book of Concealed Carry. “Defense Loads of Choice: the Word from the Street”. 2008.
The agencies who now use this high-tech round would seem to have a lot of experience in the realm of automobile sheet metal. Let me know if you hear of anything to dispute that a good 357 SIG round is no worse than any other handgun round for penetrating automobile sheet metal.