That's not necessarily true. Just because one 10mm bullet will frag does not mean another from a different manufacturer or even a different lot will. In pistols, velocity difference is not really so huge that it causes these types of issues. I have seen two different people shot in the head with a .40 and the bullet ricoched off of each one and only wounded. One was from under water which probably led to external ballistics issues, and the other was a forehead shot, but those bullets were later recalled due to some type of bad jacket bonding process. That does not mean all people shot in the head with a .40 will live or that the bullet is inneffective.While true that bullet design does make a significant difference in the effectivness of a bullet, volocity also effects it. Even a hollow point, if traveling to fast will simply splinter in to very small fragments. Even small fragments cause trauma but usually not as lethal as a large object pushing through taking flesh and organs with it. 10mm hollowpoint is a perfect example. At close range bone will cause the bullet to shatter where as a .40, though the same diameter having a lower volocity with simply deform but hold together.
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