St. Petersburg, Russian Federation
According to the results of a study of traces on bullets and shell casings formed when shooting from hunting carbines TG2 and VPO-209 cal. 366 TKM, as well as from a 9-mm PP-2000 submachine gun, the nature of the differences between general and particular signs in the traces during the production of shots with different samples of cartridges, as well as when using non-standard cartridges, has been established. The main reason for this is the different energy values of the compared bullet and shotgun cartridges cal. 366 TKM, as well as a 9×19 mm (Luger) cartridge and a 9×18 mm (PM) cartridge that is not standard for the PP-2000 submachine gun. Shooting with less powerful cartridges (shotgun cartridge cal. 366 TKM, 9×18 mm (PM) cartridge) leads to a change in the general features in the tracks compared to the tracks on parts of cal bullet cartridges cal. 366 TKM and 9×19 mm cartridge (Luger): increasing the diameter of the striker's footprint, changing the sheer shape of its walls to a flat one, eliminating the formation of a reflector footprint (shotgun cal. 366 TKM), an increase in the length of the traces of the rifling fields on the bullets of the 9×18 mm (PM) cartridge, etc. Particular features are also changing, reflecting the features of the microrelief in the traces of the firing pin, the microrelief of the surface of the forensic tag at the bottom of the firing pin (carbine VPO-209 cal. 366 TKM). Firing an abnormal 9×18 mm (PM) cartridge for a 9-mm PP-2000 submachine gun determines the unstable nature of the movement of the cartridge bullet in the barrel bore, which is expressed in different sizes of width and angle of inclination of the traces of the rifling fields among themselves on the leading part of the bullet. These features of the traces should be taken into account when solving identification and diagnostic tasks of forensic ballistics examination.
FIREARMS, ABNORMAL CARTRIDGE, TRACES ON BULLETS AND SHELL CASINGS, SIGN
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