[From the belief that werewolves could be killed with silver bullets.]
In folklore, the silver bullet is supposed to be the only kind of bullet for firearms that is effective against a werewolf, witch, or other monsters. Sometimes (not always) the silver bullet is also inscribed with Christian religious symbolism, such as a cross or the initials "J.M.J" (Jesus, Mary & Joseph).
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The term has been adopted into a general metaphor, where "silver bullet" refers to any straightforward solution perceived to have extreme effectiveness. The phrase typically appears with an expectation that some new technological development or practice will easily cure a major prevailing problem. It is quite possible, however, that this usage derives from a confusion of "silver bullet" with "magic bullet," the popular term for Dr. Paul Ehrlich's newly-discovered cure for syphilis in the early 20th century. The medical breakthrough was the subject of the 1940 film, "Dr. Ehrlich's Magic Bullet," and prompted the metaphorical use of "magic bullet" as a powerful cure for a pressing societal problem. Colloquial jargon also uses this term to refer to a tampon.
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Silver bullets differ from lead bullets in several respects. Lead has a 10% higher density than silver so a silver bullet will have a little less mass than a lead bullet of identical dimensions. Pure silver is less malleable than lead and falls between lead and copper in terms of hardness (2.5 Mohs) and shear modulus (30 GPa). As a result, a silver bullet would have no difficulty accepting the rifling of a gun barrel as both lead and copper are common bullet materials.
The terminal impact is somewhat speculative and will depend on a variety of factors including bullet size and shape, flight distance, and target material. At short ranges, the silver bullet will most likely give better penetration due to its higher shear modulus, and will not deform as much as a lead bullet. A 2007 episode of "Mythbusters"[4] demonstrated a greater penetration depth of lead bullets vs. silver bullets. Results cannot be considered conclusive, however, as the show utilized a 250-grain lead slug in a .45-caliber Colt long shell vs a lighter (190-grain) silver slug fired at closer range.
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