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Name a defense round that does not give sufficient penatration and then their May be an argument to be had here.
It is not so much what commonly used self-defence round does not give sufficient penetration, it is about what particular loadings of don't give sufficient penetration. An extreme example would be the difference between a .380 FMJ and a .380 Glasser. There is a good case to be made that the Glasser will fail to have sufficient penetration in some situations that would never be a problem for the FMJ. Another example would be hollowpoint bullets with fragile jackets that easily fragment on contact causing so much reduction in mass and consequently sectional density that they fail to penetrate sufficiently.
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