The paper discusses a new experimental investigation and analysis method conducted in the field of terminal ballistics based on shooting experiments. The shooting was performed with the aim of determining the geometry of the spall cone caused by the spallation on both sides of the target armour plate when a bullet is penetrating through it. During the measurement, armour plates made of different materials with different thickness were shot through using different bullets. The influence of the armour material type and its thickness on the spall generation was examined.