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I had heard they are hard on the throat of a barrel as the \ / shape angled hot powder gases under very high pressure/concentrated will erode it much faster than a plain base bullet.
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This would be true if the bullet were sitting there and was "sprayed" with gases like they were coming out of a hose. The shape of the bullet would redirect the gases toward the barrel.
That's not what's happening in a fired cartridge though. There's already gases against the bullet and barrel and there's simply pressure building evenly (more or less) from every direction. There is no unbalanced force redirecting gases toward the barrel.