Jisho

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Wikipedia definition
1. Cylindro-conoidal bulletThe cylindro-conoidal bullet was invented by Captain John Norton of the British 34th Regiment in 1832. It had a hollow base, so that, when fired, the bullet would expand and seal the bore. The origin of his idea is an interesting one: when in southern India, he examined the blow pipe arrows used by the natives and found that their base was formed of elastic locus pith, which by its expansion against the inner surface of the blow pipe prevented the escape of air past it. In 1836, Mr. W.
Read “Cylindro-conoidal bullet” on English Wikipedia
Read “椎の実弾” on Japanese Wikipedia
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