canister shot vs sabot

canister shot

noun
  • Antipersonnel ammunition consisting of a cylindrical canister filled with round lead or iron balls. 

sabot

noun
  • A carrier around a projectile in a firearm, cannon or other type of artillery piece that precisely holds the projectile within the barrel. 

  • A wooden shoe. 

verb
  • To enclose (a projectile) in a sabot. 

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