What are Dum-Dum bullets? - Quora
Answer (1 of 10): Dum-dum, or dumdum, bullet is a an slang term for expanding bullets, derived from the Dumdum Arsenal, near Calcutta, India. In the 1890s, the new .303 cartridge had been designed to use smokeless propellant, but this proved difficult to safely mass produce, and early issues had...
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