HEAD

The end of the cartridge case in which the primer or priming is inserted and the surface upon which the headstamp identification is imprinted.

HEADSPACE

The distance from the face of the closed breech of a firearm to the surface in the chamber on which the cartridge case seats. 1. BELT: A type of chamber design in which the cartridge seats in the chamber on an enlarged band ahead of the extractor groove of the cartridge body. 2. MOUTH: A type of chamber design in which the cartridge seats in the chamber on the mouth of the cartridge case. 3. RIMLESS: A type of chamber design in which the cartridge seats in the chamber on the shoulder of the cartridge case. 4. RIMMED: A type of chamber design in which the cartridge seats in the chamber on the rim or flange of the cartridge case.

HEADSTAMP

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.

HEELED 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.