A propellant charge used in a muzzleloading bolt action firearm having a cylindrical casing body for insertion within a breech end of a barrel. The casing body enclosing a propellant charge of predetermined amount, and having a base at the back end with a rim radially extending outwards with a forward surface facing the cylindrical body forward end and mounted flush with the barrel breech end upon insertion. A slot is formed proximate the rim to receive an extension or protrusion of an extractor for removal after firing when the bolt is moved away from the barrel.