In cases of crimes committedwith the use of fire arms, research for foren-
sic purposes is performed by experts of ballistics and criminalistic physico-
chemical examinations. Ballistics deals with the processes that a cartridge
undergoes inside the barrel of a firearm, the trajectory of the projectile, and
transformation of the kinetic energy of a projectile into other types of energy
while hitting the target [13]. Physicochemical examination of gunshot resi-
dues, also called chemical ballistics, is helpful, e.g. in identification of dam-ages and injuries caused by the use of firearms (indicating the entrance and
exit of projectile), estimation of the shooting distance and also establishing
whether a given person has used a firearm [5, 9, 19, 20].