TRIPLE BASE POWDER

A propellant composed of colloided nitrocellulose, nitroglycerine and nitroguanidine. Generally used in large caliber military ammunition.

TRUNCATED BULLET

A design of a flat-nosed bullet having a conical shape rather than a nose formed by a radius.

TRUNCATED CONE BULLET

A design of a flat-nosed bullet having a conical shape rather than ogive formed by a curve or radius.

TRY-GUN

A shoulder firearm having a stock which is fully adjustable for length of pull; drop at comb, Monte Carlo and heel; pitch and cast. It is used for fitting of custom made firearms to a specific shooter’s physical characteristics.

TUBE

1. The cylindrical body of a shotshell. 2. Improper term for a shotgun barrel. 3. A barrel insert to allow firing of a smaller gauge shotshell.

TUBE CUTOFF

A circumferential separation of a shotshell tube or body.

TUBE SIGHT

A metal tube that contains the rear sight.

TUMBLER

An English term that is sometimes used to denote a shotgun hammer. Also refers to an interior part of gun locks which contain notches that interact with the sear.

TUMBLING

1. The end-over-end rotation of an unstable projectile in flight. 2. A cleaning and polishing process, sometimes used in firearm part and ammunition manufacturing.