the opening 110 having a bottom 112 see fig2 5 the main body 102 is preferably made of a dense material such as copper lead or other alloy but any appropriate material may be used and still fall within the scope of the present invention additionally given the number of different combinations of diameters of the fragmenting projectile 100 and the differences in weights it should realized that the specific shape of the projectile 100 may be changed and fall within the scope of the present invention as well the main body 102 also includes at least two circumferential grooves extending around the main body 102 a first circumferential groove 120 is disposed between the front end 104 and a second circumferential groove 122 the first and second circumferential grooves 120 122 extend from an outer surface 114 of the main body 102 toward the opening 100 which has an axis that coincides with the longitudinal axis a of the main body 102 the second circumferential groove 122 being disposed between the first groove and the back end 106 of the main body 102 the second circumferential groove 122 may also be more preferably disposed between the first circumferential groove 120 and the bottom 112 of the opening 110 the main body 102 also includes a first plurality of slots 130 disposed around the main body 102 and extending from the front end 104 rearwardly towards.