Examination of dispersion pattern of GSR deposited on cloth target by 0.315"/8mm country made pistol at close firing range

The examination of Gun Shot Residue has become obligatory in forensic examination of firearm.GSR helps in the easy disposal of cases where the range of firing is to ascertain. GSR may use to identify the entry and exit holes and it also helps in determining whether or not a person has discharge the firearm or not. The author tried to focus attention on the examination of the dispersion pattern of GSR particles deposited on cotton cloth target at different shooting distances (4inch, 8inch and 12inch). Ten different .315’’/8mm calibre of country made pistols were used and ammunition (KF,Khadki factory, Pune) were used for test firing. All test firing was performed at firing room of ballistic division of CFSL/CBI/New Delhi. The results showed that GSR particle produce on cotton cloth by .315’’/8mm Country made pistol using .315’’/8 ammunition generates high amount of larger GSR particle which were almost completely burnt particle.The nitrite residue was continued using modified griess test that revealed a mean particle size of 3.2µm with spherical shape. As the range increases from 4’” to 12”, GSR particles produces were small in amount. Whereas SEM microscope of GSR particle directly from .315”/8m calibre of CM pistol generated irregular cluster of group gains. Sodium rhodizonate test was also applied for detection and the presence of lead residue around the bullet hole