FULL LENGTH RESIZING

The operation of reforming a fired cartridge case to approximately its original dimensions.

FULL LENGTH SIZING

The operation of reforming a fired cartridge case to approximately its original dimensions.

FULL METAL JACKET BULLET

A projectile in which the bullet jacket encloses most of the core with the exception of the base. Also called Full-Jacketed, Full Patch, Full Metal Case.

FULL-COCK

The position of the hammer or striker when the firearm is ready to fire.

FLYER

1. A shot considerably outside the normal group on a target. 2. A shot considerably outside the normal range with regards to velocity or pressure.

FOIL

Part of a primer. See Paper Disc.

FLUTING

1. See Oil-Dent. 2. Longitudinal grooves in the sidewall of a firearm chamber. 3. See Fluted Barrel.

FIRING PIN INDENT

1. The impression made by the firing-pin in the primer cup of the centerfire primer or the rim of rimfire cartridges. 2. A measure of the kinetic energy delivered by the firing-pin.

FIRING PIN PROTRUSION

The distance the firing-pin protrudes from the breech face when it is in its most forward position.

FIVE-IN-ONE BLANK

A blank cartridge that was designed for use in firearms of different calibers. It can be used in caliber 38-40, 44-40, and 45 Colt revolvers and in caliber 38-40 and 44-40 rifles.