Abstract: The invention is a carrier projectile 10 having a safety venting system wh prevents expulsion of the projectile cargo during accidental or inadvertent initiation of the expulsion charge 21. The venting system comprises a collar which closes vent holes when the projectile is fired. The normal activation sequence of the carrier projectile is firing to a predetermined range or time, activation of the expulsion charge thereby bursting open the carrier shell, and dispensing of the cargo. The venting system incorporated into the present invention precludes bursting of the carrier shell, even if the activation of the expulsion charge occurs, unless the vents have been closed by the actual firing of the projectile. The venting system provides a safety feature in the event that the projectile is subjected to fire or other thermal stress and in the event of a hot gun misfire the collar is operated by either angular acceleration or longitudinal acceleration.