on the right of fig5 illustrates a priming means in the form of a stepped disc and suitable for this type of charge external portion 30 having a greater depth s 34 for efficiently priming the less powerful peripheral explosive 27 central portion 32 having a depth s u2266 s 39 u2266 s 34 for priming the more powerful central explosive 29 the half section on the left in fig5 illustrates an adaptation of the arrangement on the right and shows a modified form adapted to the radial propagation of the detonation wave the central initiation point 0 radiates along the straight line 00 39 through the central layer 29 so that a conical form results the center 0 radiates along the straight line 00 34 through the intermediate layer 28 so that a frusto conical form 0 39 0 39 34 0 34 results the depths of the layers remain at s u2266 s 39 u2266 s 34 fig6 illustrates a further form of projectile in accordance with the invention and having a triple stage covering 33 i e stage 33a having a slope u03b1 1 stage 33b having a slope u03b1 2 and stage 33c having a slope.