The dimensional difference between the diameter of the neck of a loaded cartridge case and the chamber.
Letter: N
NECK ANNEALING
A heating process used in cartridge case manufacture intended to relieve internal stresses in the neck area caused by cold working.
NATO CARTRIDGE
A common designation for military cartridges produced under the specifications of the North Atlantic Treaty Organization.
NATIONAL MATCH BULLET
A bullet manufactured specifically for ammunition issued to competitors at the National Matches.