Broadhead push-out bullet

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.