Rifle boresInside of a firearm's barrel. have landsThe ridges between grooves inside a rifled barrel. and groovesThe spiral cuts in a rifle's bore. that spiral down the entire length of the barrel, giving the bullet or projectileMaterial that is fired from a firearm or bow. Can be a bullet, slug, shot or arrow. a spin, which stabilizes it as it travels down the barrel. It works much the way that a football spirals when thrown by a quarterback.