piston sleeve preferably defines a second cavity at an opposite longitudinal end i e from the end that couples with the primary case for fitting the bullet therein the bullet may be configured such that more than half of the length of the bullet which is exposed outside the mouth of the piston sleeve when loaded includes a substantially right cylindrical shape the mouth of the piston sleeve and the bullet may couple in part due to pressure fittings protruding inwardly from the sleeve or outwardly from the projectile or both the propellant unit cavity and propellant unit may couple in part due to pressure fitting protruding inwardly from the primary case or outwardly from propellant unit or both a method of preparing a two piece two stage rechargeable reusable mechanically operating cartridge including a piston sleeve a primary case a propellant unit and bullet is also provided a bullet of non lethal composition is loaded into the mouth defined within the piston sleeve a propellant unit is loaded into a cavity defined within the primary case or a propellant mechanism is coupled with the cavity the piston sleeve is axially coupled with the primary case including an initial relative axial displacement of the sleeve and base to bring them together cog portions or partial annular protrusions of the piston sleeve are coupled with annular channels of the primary base during the initial axial displacement the piston sleeve and primary case are relatively rotationally displaced after the initial axial displacement such as to prevent direct axial separation partially annular channels extend.