Why doesn't the shell casing of a bullet expand when the bullet is

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In terms of terminal ballistics, what is more devastating, a bullet that passes through or a bullet that does a total energy dump and stops? - Quora

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In designing a hollow point bullet, if it had notches only on one side so it would expand only on that side, would the bullet tumble inside tissue making it deadlier?

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In designing a hollow point bullet, if it had notches only on one side so it would expand only on that side, would the bullet tumble inside tissue making it deadlier?

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Why is it that when mortars fire there is no spent casing? - Quora