Letter: B

1. An instrument that measures the force required to extract a bullet from live ammunition. 2. A tool used to remove bullets from live ammunition.

A process wherein a hardened steel disc or button with a rifling cross section configuration is pushed or pulled through a drilled and reamed barrel so as to cold form the rifling grooves to the desired depth and twist.

Slippage or stripping occurs if the bullet fails to engage the rifling properly.

The rotational motion imparted to the bullet by the rifling in the barrel.

A mechanical device used to detect the amount of eccentricity in a bullet between its rotational axis and the outer surface of the bullet.

The spatter and fragmentation of a bullet upon impacting a hard surface.

The principal to account for the steadiness of flight conferred upon an elongated projectile.

The instability of a bullet in flight in which the point of the bullet is not aligned with the direction of flight.