1. The difference between the bullet’s vertical position relative to the bore axis at any given point in its flight.
2. In ballistic performance tables, the deviation from the line-of-sight and the bullet’s position at any given point in its flight. In this usage, knowledge of the distance at which the sighting device is adjusted to yield a deviation of *zero* (“sighting-in” range) must be known.
1. The grooves cut into a bullet by barrel rifling. 2. The forming of grooves in a bullet by the barrel rifling.
A separate layer in a bullet’s construction on at least the portion of the bullet engaging the firearm’s rifling.
The distance that a bullet must travel from its position at rest in the cartridge case to its initial engagement of the rifling.
The tool used to lubricate bullets.
A reduction in the internal diameter of a firearm bore.
1. Rifled barrels: the minor interior diameter of a barrel which is the diameter of a circle formed by the tops of the lands. 2. Shotguns or muskets, the interior dimension of the barrel forward of the chamber but before any restrictive choke or expanded muzzle.
A method of aligning a barrel on a target by aiming through the bore. May be part of the sight alignment procedure.
An illuminated, optical device for examining the interior of the bore of a firearm.
An action commonly used in break-open firearms in which the hammer and hammer springs are located within the frame and are self-cocking.
