magnum

/M AE1 G N AH0 M/
noun
  1. 1

    A bottle of wine containing 1.5 liters of fluid, double the volume of a standard bottle.

  2. 2

    A powerful firearm cartridge, often derived from a shorter, less powerful cartridge calibre that uses the same bullet.

  3. 3

    A handgun that fires a cartridge of this calibre; chiefly a revolver, but rarely an autoloader firing an unusually powerful calibre.

Source: https://en.wiktionary.org/wiki/magnum