A short-range projectile for practice ammunition having an axial air inlet duct emanating from the front end of the projectile and at least one outlet duct connecting the inlet duct with the jacket of the projectile. At least one of the inlet and outlet ducts are blocked during the initial flight path of the projectile by a blocking member displaceable in a chronologically controlled manner. The blocking member is displaceable in response to an air pressure head occurring during flight of the projectile from a starting position for preventing the influx of air from the inlet duct to the outlet duct to a final position wherein communication and influx of air from the inlet duct to the outlet duct is completely enabled.
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