A method for launching projectiles onto a target to be reached, using a launching device adapted to launch an unguided primary projectile carrying a plurality of secondary projectiles and to program a dispersion by the primary projectile of the plurality of secondary projectiles within a dispersal cone, with an associated dispersal velocity, an interception plane, orthogonal with respect to the dispersal cone passing through the target defining a dispersal radius of the secondary projectiles comprising the steps of: - estimating at least one characteristic parameter of the target, comprising an estimated velocity of the target and a distance between the target and the launching device, - determining characteristic parameters of the launching device, including the dispersion velocity of the secondary projectiles and a characteristic value of the dispersion cone, for an interception distance between the launching device and the interception plane, - calculating (26, 28) an optimum dispersion radius for maximising a probability of damaging the target, as a function of the characteristic parameter(s) of the target and the characteristic parameters of the launching device, the calculation of the optimum dispersion radius comprising a comparison of the interception distance (D inter) with a threshold distance (D th), and the selection of a calculation method as a function of the result of the comparison, in which, when the interception distance (D inter) is greater than the threshold distance (D th), the method comprises a step of estimating parameters of the secondary projectiles and a calculation (32, 34) of the optimum dispersion radius by numerically solving an equation involving said parameters of the secondary projectiles, characteristic parameters of the target, and characteristic parameters of the launching device, in which, said target having a wall, the estimating of the parameters of the secondary projectiles comprises the estimating of a perforation velocity equal to the loss of velocity of a secondary projectile when passing through the wall of the target, of a distance travelled by a secondary projectile to reach the perforation velocity, and of a coefficient of deceleration of the secondary projectile passing through the wall, and - calculating a parameter for programming the dispersion of the primary projectile as a function of the calculated optimum dispersion radius. - estimating at least one characteristic parameter of the target, comprising an estimated velocity of the target and a distance between the target and the launching device, - determining characteristic parameters of the launching device, including the dispersion velocity of the secondary projectiles and a characteristic value of the dispersion cone, for an interception distance between the launching device and the interception plane, - calculating (26, 28) an optimum dispersion radius for maximising a probability of damaging the target, as a function of the characteristic parameter(s) of the target and the characteristic parameters of the launching device, the calculation of the optimum dispersion radius comprising a comparison of the interception distance (D inter) with a threshold distance (D th), and the selection of a calculation method as a function of the result of the comparison, in which, when the interception distance (D inter) is greater than the threshold distance (D th), the method comprises a step of estimating parameters of the secondary projectiles and a calculation (32, 34) of the optimum dispersion radius by numerically solving an equation involving said parameters of the secondary projectiles, characteristic parameters of the target, and characteristic parameters of the launching device, in which, said target having a wall, the estimating of the parameters of the secondary projectiles comprises the estimating of a perforation velocity equal to the loss of velocity of a secondary projectile when passing through the wall of the target, of a distance travelled by a secondary projectile to reach the perforation velocity, and of a coefficient of deceleration of the secondary projectile passing through the wall, and in which, when the interception distance (D inter) is greater than the threshold distance (D th), the method comprises a step of estimating parameters of the secondary projectiles and a calculation (32, 34) of the optimum dispersion radius by numerically solving an equation involving said parameters of the secondary projectiles, characteristic parameters of the target, and characteristic parameters of the launching device, in which, said target having a wall, the estimating of the parameters of the secondary projectiles comprises the estimating of a perforation velocity equal to the loss of velocity of a secondary projectile when passing through the wall of the target, of a distance travelled by a secondary projectile to reach the perforation velocity, and of a coefficient of deceleration of the secondary projectile passing through the wall, and - calculating a parameter for programming the dispersion of the primary projectile as a function of the calculated optimum dispersion radius.