rifled slug

American  

noun

1. a shotgun projectile with helical grooves on its sides for imparting a spin to it when it is fired through the smooth bore of the shotgun.

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Example Sentences

Halsey said deputies typically load two rubber bullets followed by two rifled slug rounds when loading weapons for wildlife control.

From Washington Post

“In this incident, in the darkness, the deputy incorrectly stacked his rounds by mistake, thereby making the second round fired out of the shotgun a rifled slug rather than a rubber-projectile wildlife control round,” Halsey said.

From Washington Post