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U
nlike handguns and rifles which have lands-and-
grooves cut on the inside of their barrels, shotguns
have a smooth bore. Lands-and-grooves cause specific
identifying features (rifling) on projectiles as they pass
along the barrel. These markings allow examiners to
test-fire weapons and compare test-fired bullets to those
discovered in bodies. Since shotguns have no lands-and-
grooves, their projectiles cannot be positively matched to
those found at the scene or inside a body.
A shotgun cartridge contains pellets, gunpowder, and
a wad that separates the pellets from the gunpowder.
Some ammunition have plastic shot containers that hold
the pellets and also act as the wad. The recovery of the
wad or plastic shot container is important because they
may be specific for certain types of ammunition. Shot-
guns usually fire pellets; however, slugs can also be used
as ammunition.
The range (distance) of fire can usually be more easily
determined in shotguns than in handguns or rifles. In
addition to the presence or absence of gunpowder, the
presence or absence of pellet spread aids in the distance
determination. However, it is still important to test-fire
the same gun and ammunition that was used in the
shooting to determine an accurate comparison with the
distance in question.
Chapter 8
SHOTGUN INJURIES
FIGURE 8.1 A shotgun blast can be very destructive. This
man stuck the gun in his mouth.
FIGURE 8.2 Tight contact shotgun wound of the chest. All of
the gunpowder is inside the wound. The wound edges are
abraded and there is a thin linear abrasion on the upper right
from the muzzle.
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