THE INFLUENCE OF THE CHARACTERISTICS OF INDIVIDUAL VARIETIES OF 10 × 31 LIGHT AND SOUND CARTRIDGES ON THE FORMATION OF TRACES OF THE TT-CX PISTOL ON SPENT CARTRIDGES
Journal: FORENSIC EXAMINATION
№ 3
, 2023
Authors:
1.
Saint Petersburg University of the Ministry Internal Affairs of Russian Federation
St. Petersburg, Russian Federation
St. Petersburg, Russian Federation
Type:
Article
Pages:
from 31
to 40
Status:
Published
Received:
11.06.2023
Accepted:
30.06.2023
Published:
27.09.2023
Subject area:
UDC 343.983.22
Language:
Russian
Keywords:
LIGHT AND SOUND PISTOL, CARTRIDGE, SLEEVE, TRACES OF WEAPONS, SHUTTER CUP
Abstract:
The paper considers the influence of the design and functional characteristics of the 10 × 31 TT-CX and PPSh-CX light and sound cartridges on the display of traces of parts and parts of the TT-CX light and sound pistol on spent cartridges. The difference between the traces of the shutter cup, reflector, point of the striker formed when firing from one copy of the TT-CX light-sonic pistol with 10 × 31 light-sonic cartridges of two varieties was revealed: TT-CX and PPSh-CX. It was found that due to the functionally low recoil energy of the bolt group of the pistol when firing 10 × 31 TT-CX cartridges, the trace of the reflector is displayed extremely weakly or not reflected at all at the end of the bottom part. The trace of the shutter cup has the form of short linear impressions. However, when firing a more powerful 10 × 31 PPSh-CX cartridge, this pattern is supplemented with traces in the form of thin concentric impressions, and the trace of the reflector is well expressed on all experimentally fired cartridges. The mechanism of the formation of traces of the shutter cup is revealed, which, under conditions of a 10 × 31 shot with a TT-CX cartridge, provides force contact with the surface of the cartridge capsule of the TT-CX cartridge only of the external relief of the structure of the surface of the shutter cup. When firing a 10 × 31 PPSh-CX cartridge, the force contact is supplemented by the interaction of the cartridge capsule surface with a deeper relief in the structure of the surface of the pistol shutter cup. Minor differences in the diameters of the striker track on spent cartridges are determined by the design feature of the 10 × 31 PPSh-CX cartridge - a capsule planted below the level of the plane of the end face of the bottom part of the sleeve. These circumstances should be taken into account when an expert solves identification and diagnostic tasks for the study of the TT-CX light and sound pistol and its traces on the spent cartridges of 10 × 31 light and sound cartridges.
The paper considers the influence of the design and functional characteristics of the 10 × 31 TT-CX and PPSh-CX light and sound cartridges on the display of traces of parts and parts of the TT-CX light and sound pistol on spent cartridges. The difference between the traces of the shutter cup, reflector, point of the striker formed when firing from one copy of the TT-CX light-sonic pistol with 10 × 31 light-sonic cartridges of two varieties was revealed: TT-CX and PPSh-CX. It was found that due to the functionally low recoil energy of the bolt group of the pistol when firing 10 × 31 TT-CX cartridges, the trace of the reflector is displayed extremely weakly or not reflected at all at the end of the bottom part. The trace of the shutter cup has the form of short linear impressions. However, when firing a more powerful 10 × 31 PPSh-CX cartridge, this pattern is supplemented with traces in the form of thin concentric impressions, and the trace of the reflector is well expressed on all experimentally fired cartridges. The mechanism of the formation of traces of the shutter cup is revealed, which, under conditions of a 10 × 31 shot with a TT-CX cartridge, provides force contact with the surface of the cartridge capsule of the TT-CX cartridge only of the external relief of the structure of the surface of the shutter cup. When firing a 10 × 31 PPSh-CX cartridge, the force contact is supplemented by the interaction of the cartridge capsule surface with a deeper relief in the structure of the surface of the pistol shutter cup. Minor differences in the diameters of the striker track on spent cartridges are determined by the design feature of the 10 × 31 PPSh-CX cartridge - a capsule planted below the level of the plane of the end face of the bottom part of the sleeve. These circumstances should be taken into account when an expert solves identification and diagnostic tasks for the study of the TT-CX light and sound pistol and its traces on the spent cartridges of 10 × 31 light and sound cartridges.
Keywords:
LIGHT AND SOUND PISTOL, CARTRIDGE, SLEEVE, TRACES OF WEAPONS, SHUTTER CUP
LIGHT AND SOUND PISTOL, CARTRIDGE, SLEEVE, TRACES OF WEAPONS, SHUTTER CUP
1. Latyshov I. V., Samuylenko F. P. Nature of scientific knowledge of firing conditions and their place in the forensic ballistics system. Vestnik of the St. Petersburg University of the Russian Ministry of Internal Affairs, 158-164, 2019. (In Russ.).
2. Kokin A. V. Theory and methodological bases of research of rifled firearms on the marks on bullets. Moscow: Yurlitinform; 2010: 352. (In Russ.).
