Archives: Glossary

A device used in a firearm to determine the distance between the breech face and the chamber surface on which the cartridge seats. Also called Breeching Plug.

Numerals, letters and symbols (or combinations) stamped into the head of a cartridge case or shotshell to identify the manufacturer, caliber or Gauge, and other additional information.

1. The part of a rifle or shotgun stock at the top of the butt end. 2. The rear portion of a bullet.

A recess in the base of a bullet.

A bullet design where the portion of the bullet exterior to the shellcase has the same diameter as the case, and steps down to a narrower “heel” portion that fits inside the case.

The term commonly applied to a shotshell with a high metal cup, but properly applies to the height of the internal base wad. Often misused as synonymous with high brass or high cup.

Common terminology referring to the length of the external metal cup on a shotshell. See High Cup

Correct term for shotshells having a high metal head type of construction.

A cylindrical member at the forward end of a frame about which the barrel or barrels pivot. Also called a Joint Pin.

An action in which the barrel(s), one or more being either smooth or rifled, is pivoted on the frame. When the action is open, the barrel may pivot up or down or sideways for loading or unloading. When the action is closed, the breech of the barrels swings against the standing breech. Opening is normally accomplished by movement of a top, side, or under lever. A top break action is an example of a hinged frame action.