Forensic Ballistics: Range of Firing Determination

UGC-NET Forensic Science Unit V drill on the determination of range of firing from gunshot wound and clothing examination. Covers the four classical range categories (contact, close, intermediate and distant), the morphological features that anchor each band (muzzle imprint and stellate tearing for contact, soot deposition and powder tattooing for close, partial powder with no soot for intermediate, only an entrance abrasion collar for distant), and the chemical confirmation tests (Walker test for nitrites from partially burnt propellant, modified Griess test on filter paper with sulphanilic acid and N-1-naphthylethylenediamine for nitrites, sodium rhodizonate for lead residues, dithiooxamide for copper from jacketed-bullet residue). The intermediate-range cut-offs follow DiMaio's classification, with close range under about 60 cm, intermediate from 60 cm to roughly 1 m, and distant beyond the powder reach of the cartridge. The mock also covers the test-firing reconstruction workflow: use the suspect weapon and ammunition of the same lot, build a comparison panel of patterns at known distances, and bracket the questioned wound between two adjacent panels.

Targeted at MSc and BSc Forensic Science students preparing for UGC-NET Paper II Unit V, NFSU MSc Forensic Ballistics entrance, and FACT applied modules, the mock is also useful for police investigators handling gunshot fatalities and for medico-legal autopsy surgeons who write range opinions for the trial court.

Topics covered:

• Range categories: contact, close (under 60 cm), intermediate, distant
• Contact wound features: muzzle imprint, stellate tearing, blackening
• Close-range features: soot, powder tattooing, abraded collar
• Intermediate range: partial powder, single unburnt grains, no soot
• Distant range: only entry abrasion collar, no soot or tattooing
• Walker test, modified Griess test, sodium rhodizonate, dithiooxamide
• Test-firing reconstruction with comparison panels at known distances
• Bracketing the questioned wound between two adjacent comparison panels

Useful for self-assessment before a deeper Unit V revision push. Allow 30 minutes.