Secondary Projectile
Definition
A bone fragment or other material driven at high velocity through adjacent tissue by the primary projectile's passage through bone; produces irregular, non-beveled defects that must be distinguished from primary bullet wounds in multi-wound analysis.
- Field
- Ballistic trauma analysis
- Cause
- Bone fragment driven through bone by bullet
- Wound character
- Irregular, non-beveled defect
- Forensic task
- Must distinguish from primary gunshot wounds
Common questions
What features distinguish a secondary projectile wound from a primary gunshot wound?+
Secondary projectile defects generally lack the clean beveling and consistent shape of a direct bullet wound, appear irregular in outline, and lie off the primary bullet's calculated trajectory rather than along it.
Why does the distinction matter in a multi-wound case?+
Miscounting a secondary-projectile defect as an additional gunshot wound can distort reconstructions of shots fired, shooter position, or event sequence, so trajectory and wound-morphology analysis is required before assigning each defect to a shot.
Are secondary projectile wounds always caused by bone fragments?+
Bone is the most common source given its density, but other dense material driven by the primary projectile's passage, such as clothing fasteners or fragments of the projectile itself, can also act as secondary projectiles.
Related terms
- Bearing Surface Diameter
- The diameter of the projectile face in contact with the bone surface at the moment of impact; smaller than the resulting defect...
- Contact Wound
- A firearm wound produced when the muzzle is pressed against or within a few centimetres of the target surface. Characterised by a...
- External Beveling
- The cone-shaped defect geometry at an exit gunshot wound in bone: the inner table diameter (entry face of the defect) is smaller...
- GSR (Gunshot Residue)
- Primer-combustion products (classically lead-barium-antimony compounds, now also non-lead formulations) deposited on the bone surface at close or contact range; detected by SEM-EDX...
- Internal Beveling
- The cone-shaped defect geometry at an entrance gunshot wound in bone: the outer table diameter (entry face) is smaller than the inner...
- Keyhole Defect
- An asymmetric gunshot defect produced by a projectile striking bone at a shallow angle; one end shows a conventional beveled entry geometry...
- Puppe's Rule
- The 1994 formalisation of the principle that radial fractures from a subsequent gunshot terminate at fracture lines already produced by a prior...
- Stellate Fracture
- A set of radial cracks extending outward from the main gunshot defect, produced by compressed propellant gas pressure radiating under the scalp...
- Trajectory Reconstruction
- The forensic procedure that integrates the osteological bevel direction, angle-of-impact estimate, and the physical scene evidence to reconstruct the relative positions of...