I'm not sure if this was a movie, book, or TV show. The basic scene was a standoff where the protagonist (or possibly their mentor) vibrates the metal in the chambered bullets to jam the enemy's guns and make a quick escape. All of the details are hazy except for the bullets being ever so slightly expanded to jam the guns.
1 Answer
In Doctor Who: The Sontaran Strategem, the Sontarans use a "cordolane signal" to cause the bullets to jam in the guns of their enemies.
The figure reveals that the room is contained within a cordolane signal that excites the copper surface of the bullet and causes expansion in the barrel, rendering their guns useless, as well as blocking their radio signals (during which time Gray tries using his pistol but finds that is also useless).
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Bingo. This has got to be it, I was wavering about whether I should mention the keyword "copper" or whether it was a figment of my imagination.– LandonCommented Aug 14, 2015 at 20:26
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The copper is actually key. Despite what the Doctor occasionally thinks, UNIT soldiers aren't actually stupid, and once he explains to them how the cordolane signal works...– Jon BCommented Aug 16, 2015 at 23:50