hogshead vs magnum

hogshead

noun
  • An English measure of capacity for liquids, containing 63 wine gallons, or about 52+¹⁄₂ imperial gallons; a half pipe. 

  • A large barrel or cask of indefinite contents, especially one containing from 100 to 140 gallons. 

magnum

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

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

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

How often have the words hogshead and magnum occurred in a corpus of books? (source: Google Ngram Viewer )