Instead of swapping stories, we can just look at birdshot vs buckshot penetration tests.
12 gauge Wound Profiles
Its abundantly clear from the above test results that birdshot is inadequate for defense
. There are also several other tests that can be found on the net, all showing the same kind of results.
A very small percentage of people continue to insist that bird shot is adequate for defense. Although they have no evidence to support their claims.