Ammunition cartridge with a base plug vent

A method of manufacturing an ammunition cartridge comprised of a projectile inserted in, and mechanically connected to, a metal cartridge case having a propulsion chamber and a base, and an energetic propellant disposed in the propulsion chamber;

• wherein the base has a central internal cavity that is provided with an ejectable, solid base plug in which is mounted an igniter with an energetic primer;
• and
• wherein the base includes at least one passage from the internal cavity to the exterior;
• said method comprising the steps of:
• (a) inserting a solid base plug into said internal cavity of the base forming an interface between the base plug and the base that surrounds it;
• (b) injecting a fusible material at an elevated temperature through said at least one passage into said interface and allowing said fusible material to solidify at an ambient temperature;
• and
• (c) mounting an igniter with an energetic primer in said base plug.