traces on cartridge cases

Capabilities of Forensic Examination of Traces on Fired Cases in Their Multiple Use (in Terms of Caliber .300 WIN MAG, .338 LM and 5,6х39 Hunter’s Cartridges)

Introduction. Recently in expert practice there registered the instances of using homemade reloaded rifled weapon cartridges. Objects and tasks. To consider the regularities of trace impression formed by reloading facilities on the microrelief of cases. To detect the most stable (specific, characteristic) features reflected on the reloaded cases thus enabling to differentiate between the traces of production mechanisms and arms. Experimental part. Examining the traces formed in the course of a shot and reloading was carried out with hunter’s .300 WIN MAG caliber cartridge cases ejected from .300 WIN MAG caliber Sauer 202 carbine; with.338 LM caliber cartridge cases ejected from .338 LM caliber HS Precission-2000 carbine; with 5.6х39 caliber cartridge cases ejected from 5.6х39 caliber Bars-4 carbine. Discution of results. In terms of the cases examined the analysis of resistance and stability degree of the process of trace impression by the used production reloading mechanisms was conducted. Characteristic features typical of reloaded (repeatedly used) hunter’s cartridge cases for rifled-barrel firing guns were detected.

Problems of Ensuring Compliance of Technical Characteristics of Civil and Office Firearms to Criminalistic Requirements of the Ministry of Internal Affairs of Russia

Introduction. Problematic issues of providing the criminalistic requirements of the Ministry of Internal Affairs of Russia imposed to firearms are considered in work. A sometimes weapons does not provide formation on the shot bullets and cartridge cases of the traces suitable for identification. Absence of any standards or specifications on a roughness of a relief of surfaces of the details forming traces is to it the reason. In addition, arms manufacturers poorly represent modern methods and technical means of identification of the weapon. Experimental part. In work the reasons of formation of traces on the shot bullets and shot cartridge cases not suitable for identification of the weapon are analyzed. Cases where the identification of the weapons on the striker traces is impossible due to the design of shells hunting cartridges are shown in the article. The negative influence of the production of primers traces at identifying of weapons on firing pin traces is quickly studied. Conclusion. Forensic requirements for identification of the weapon can be most effectively provided at close scientific and technical cooperation of the arms manufacturers and scientists specializing in area of judicial identification of the weapon.