Abstract: The device is employed in connection with armor-piercing projectiles so as to improve penetration into armor. The projectile is in the form of a substantially rotation symmetrical projectile body containing a core and surrounding projectile body wherein the core is of a material which, under the penetration conditions prevailing for armor penetration, has a hardness which is greater than in the surrounding projectile body. In that a spiculated nose is formed, the mass forces on displacement of the armor material ahead of the projectile will be reduced and penentration will be increased.