A mechanical tight cartridge casing release of the invention is preferably for inclusion with a large cartridge rifle bolt and includes a pivot mounting of a rifle bolt arm or handle to the bolt whereby, after the arm or handle is moved to an unlocked position, an application of a force to the arm or handle end wil pivot that arm or handle relative to the bolt surface such that an arm or handle forward shoulder engages a surface of the rifle receiver producing a lever action and providing a mechanical advantage to the force applied by an operator or shooter that arm or handle to "break loose" the spent cartridge casing from the barrel chamber, with the bolt to then be moved rearwardly to where the casing is ejected. The relationship of the distance from the bolt handle end that is pulled by the operator or shooter to the arm or handle pivot and the distance from the pivot to the handle forward shoulder is selected to provide a desired mechanical advantage whereby a pulling force as is exerted through the arm or handle is increased to "break loose" the spent cartridge casing that will have expanded in the rifle chamber when the cartridge is fired.