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It was made because of the use of hardball ammo failure in 9mm.
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Actually the 10mm was developed because
one round of 9mm Winchester Silvertip did exactly what it was designed to do when fired through a felon's bicep and chest. It was designed to not 'over penetrate'.
Link with autopsy photos.
That single round, fired in a wild melee of a gunfight, changed our perception of what constitutes acceptable performance from defense/duty ammunition.
But our perception is all that changed. Had the above subject been hit with an 1880's 45 Colt blackpowder load from a Colt SAA, penetration would not have been an issue. The human learning curve always forms a circle:
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“You should tell someone what you know. There should be a history, so that men can learn from it.” He smiled. “Men do not learn from history. Each generation believes itself brighter than the last, each believes it can survive the mistakes of the older ones. Each discovers each old thing and they throw up their hands and say ‘See! Look what I have found! Look upon what I know!’ And each believes it is something new.” Louis L’Amour The Californios
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