The Difference of Bullet Marks on Metal Sheets from FMJ, JHP and LRN Bullets
Keywords:Bullet Marks on Metal Sheets, FMJ (Full Metal Jacket), JHP (Jacketed Hollow Point), LRN (Lead Round Nose)
The purpose of this research was to study the pattern and the difference of marks
on the metal door car caused by the collision of gunshots using FMJ (Full Metal Jacket),
JHP (Jacketed Hollow Point) and LRN (Lead Round Nose), shot from a 9 mm Glock
automatic pistol at the different distances. This research methodology was experimental.
In this experiment, the metal sheets were from a Chevrolet sedan in two measuring
30 x 30 x 0.12 cm. The gun used in this research was a Glock 19 9 mm semi-automatic
pistol. The shooting assessment tested three different distances. The images of bullet
marks on the metal sheets were recorded by digital camera. The width, length and depth
of bullet marks were measured by the digital vernier caliper and the obtained data were
statistically analyzed. The results revealed that the sizes of bullet marks on the metal
sheets caused by JHP (Jacketed Hollow Point) were larger than the bullet marks from FMJ
(Full Metal Jacket) and LRN (Lead Round Nose). However, the distance of shooting had no
effect to the average width and length of bullet marks; the kind of bullet of shot affected
the average of width and length of bullet marks (at the significant level of 0.05).