Abstract: A lost motion connection structure is provided between an oscillatable reloading press handle and the oscillatable primer arm of the press and is operative to automatically swing the primer arm of the press between primer pickup and primer positioning positions during oscillation of the press handle to reciprocally shift the shell holder of the press between the die sizing and primer press positions thereof. The lost motion connection structure is fully adjustable whereby the position of the primer arm in the primer pickup position thereof may be adjusted according to the positioning of an associated primer tube and includes lost motion structure whereby the primer arm may be swung to the primer positioning position during initial movement of the shell holder from the die sizing position toward the primer press position.