Test-Firing Programme
Definition
Comparative discharges conducted with the specific weapon and ammunition type at measured distances, producing documented patterns used to calibrate range estimation against case findings. The required validation method for any forensic range opinion.
- Purpose
- Calibrate range estimation against case findings
- Method
- Comparative discharges at measured distances
- Requirement
- Same weapon and ammunition type as the case
- Status
- Required validation step for a range opinion
Common questions
Is a test-firing programme always mandatory before a range opinion?+
Yes, an opinion on firing distance offered without a matched test-fire comparison lacks the empirical basis needed to withstand scrutiny, since residue patterns vary enough between weapons and loads that generic tables are not sufficient.
What happens if the exact ammunition batch cannot be sourced?+
The examiner uses the closest available ammunition of the same type and documents the substitution, noting that any resulting distance estimate carries wider uncertainty than one produced with the identical batch.
Related terms
- Abrasion Collar
- The rim of abraded, dried skin surrounding a gunshot entry wound, produced by the bullet stretching the skin inward before perforation. Width...
- Contact Wound
- A firearm wound produced when the muzzle is pressed against or within a few centimetres of the target surface. Characterised by a...
- Distant Wound
- Entry wound produced beyond the dispersion range of propellant products. Shows only the mechanical bullet-entry findings: abrasion collar, clean wound margins, no...
- Intermediate Wound
- Entry wound produced within the range at which unburned or partially burned propellant grains retain enough velocity to impact the skin and...
- Muzzle Imprint (Muzzle Contusion Ring)
- The bruise or abrasion left on the skin by the barrel rim at contact range. The shape mirrors the muzzle geometry of...
- Near-Contact Wound
- Entry wound produced at approximately 0.5 to 5 centimetres muzzle distance (calibre-dependent). Dense soot deposits on the skin surface around the entry...
- Powder Tattooing (Stippling)
- Intradermal haemorrhagic abrasion points caused by individual unburned or partially burned propellant grains impacting the skin at intermediate range. Cannot be removed...
- Stellate Laceration
- A star-shaped tearing of the skin at the entry wound, produced by the gas pressure at contact range when the wound overlies...