located within the casing 2 at the time of delivery to a target area the payload 4 in the preferred embodiment comprises a plurality of grenades that are deployed when the projectile 1 reaches a target area as is understood by those of ordinary skill in the art the payload 4 is deployed and dispersed by forcing the payload 4 out of the aft end of the casing 2 by expulsion gasses that enter the interior of the casing 2 through expel gas port 14 the pressure of the gas forces the payload 4 out the aft end of the projectile 1 as this occurs a bladder not shown in the payload forces the grenades out and away from the payload thus creating a pattern of dispersion of the grenades into the vicinity of the target area in order to maintain expel gas pressure the payload is fitted with a bulkhead 6 at the fore end thus the expel gasses are trapped inside of the casing 2 by the bulkhead 6 the bulkhead 6 is attached to the payload so that it is ultimately expelled from the casing 2 by the expel gasses the present invention advantageously utilizes the existing expel gas forces to not only expel the payload 4 so as to disperse the grenades but also to impart a spin or rotation 12 to the expelled payload this is accomplished by machining rifling 10 onto the inner surface of the casing 2 this rifling can be formed as grooves in the casing surface or as ridges in the casing surface note that optimum performance is achieved where the bore of the casing is round and.