The invention relates to ammunition for missile weapon and firearm.

The cavitating core of the invention comprises a head part conjugated with a secant nose surface along the cavitating edge, a central part, and an aft part with a gliding surface, wherein the caliber of the core is defined by the maximum diameter of the circle describing the core cross-section. The contour line enveloping the cross-sections from the cavitating edge to the core caliber in the plane of the core axial longitudinal section is limited by the dependence: $${\mathrm{D}}_{\mathrm{x}}\mathrm{=}\mathrm{d}\mathrm{\times }{\left[\mathrm{1}\mathrm{+}\left({\mathrm{L}}_{\mathrm{x}}\mathrm{/}\mathrm{d}\right)\mathrm{\times }{\left(\mathrm{2}\mathrm{\times }\mathrm{sin\; \phi }\mathrm{/}\mathrm{\pi }\right)}^{\mathrm{1}\mathrm{/}\mathrm{N}}\right]}^{\mathrm{N}},$$

where

D_x - is the current diameter of the core enveloping contour R, mm;

d - is the cavitating edge diameter, mm;

L_x - is the current distance from the cavitating edge to the core caliber, mm;

ϕ = 60°...270° - is the apex angle of the tangents to the secant nose surface at the points of its conjugation with the cavitating edge measured from the side of the head part;

N = (2π / ϕ)^0,4...(2π / ϕ)^0,2 - is the core volume factor, wherein the core caliber is equal to the current diameter of the core enveloping contour D_x.

As a result the invention makes it possible to increase the effective distance for hitting underwater targets when shooting from the air to the water and/or during underwater shooting using arbalests, harpoon guns, artillery, small and sporting-and-hunting weapons.