
An expanding bullet is a bullet designed to expand on impact, increasing in diameter to limit penetration and/or produce a larger diameter wound. It is informally known as a Dum-dum or dumdum bullet. The two typical designs are the hollow-point bullet and the soft-point bullet. ==Names== Expanding bullets were given the name Dum-dum, or dumdum, af...
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http://en.wikipedia.org/wiki/Expanding_bullet

An expanding bullet is a bullet designed to expand on impact, increasing in diameter to limit penetration and/or produce a larger diameter wound. The two typical designs are the hollow point bullet and the soft point bullet.
Found on
http://en.wikipedia.org/wiki/Glossary_of_firearms_terms
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