bust a cap vs shoot out

bust a cap

verb
  • To fire a weapon; to shoot with a gun. 

shoot out

verb
  • To fire from a weapon. 

  • To destroy something or remove something from its usual location by shooting. 

  • To completely extirpate (wildlife) from an area by shooting. 

  • To emerge with great speed. 

How often have the words bust a cap and shoot out occurred in a corpus of books? (source: Google Ngram Viewer )