Patent ID: 8783184

Claim:
A cartridge for a firearm, the cartridge comprising: a bullet, the bullet comprising: an external-end; and a propellant-end within the cartridge, the bullet defining a chamber, the chamber comprising: a chamber top-end, a chamber bottom-end, and a chamber width, the chamber top-end situated nearest the external end of the bullet and the chamber bottom-end situated nearest the propellant-end; a first portion, the first portion comprising a wall extending vertically between the chamber bottom-end and a point below the chamber top-end; and a second portion, the second portion enlarging the chamber width and extending from the chamber top-end to the point; the bullet further defining a channel passage leading out through the external end; an arrowhead slidable engaged within the channel passage; a shaft connected to the arrowhead and passing down from the arrowhead to a shaft end-point within the chamber; and a thrust plate connected to the shaft end-point, the thrust plate comprised of a spring metal and configured to spring open when it rises to the second portion and thereby inhibit downward motion of the thrust plate.