crack shot vs rifleman

crack shot

noun
  • An expert marksman with a gun. 

rifleman

noun
  • A person especially skilled in the use of a rifle. 

  • A small wrenlike insectivorous passerine bird endemic to New Zealand, Acanthisitta chloris, the titipounamu. 

  • A soldier trained to use a rifle as their primary weapon. 

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