This video by TheFirearmGuy tests the penetration capabilities of .22 LR, 00 Buckshot, and #4 Birdshot through a standard residential metal-skinned, insulated door. The .22 LR and 00 Buckshot easily penetrated, posing a risk of over-penetration. #4 Birdshot, however, showed limited penetration, making it a potentially safer option for home defense when the backstop is a concern.
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