I was at Thunder Ranch for a Triad class and we shot a 70's Ford with every caliber present in the class: 9mm .40 .45 .223, 7.62x39 12ga 00B 4B and 71/2 bird.
Penetration of car doors was not common with any 9mm if the round hit any feature of the car door and minimal if it did not hit a handle. .45 ball went through 2 doors. 223 is not a good penetrator, nor is the buck. 7.62 and slugsd work good.
Don't carry a long barreled pistol. Carry a more effective weapon.
Noel
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