Firearms and Ballistics Biweekly Check-in

1

The spiral pattern cut into the bore consists of raised areas called and depressions called .

1

Drag and drop the terms onto the image to label the schematic of a bullet.

Explain why GSR cannot be used to connect a suspect to a weapon used in commission of a crime.

1

A firearm is discharged 500 feet away from a target (as shown in the figure below). The bullet travels at a speed of 750 ft/sec when ejected from the barrel.
How long does the bullet take to reach the target?
_______ (round to 2 decimal places)

How far does the bullet fall while it is airborne?
_______ (round to 2 decimal places)

1

Calculate the entry angle of the bullet that made this hole (see show your work)!
_______ (round to 2 decimal places)

1

Count how many lands/grooves are shown on each barrel cross-section!

Categorize the following breechface impression!

1

Categorize the bullets as left twist or right twist.

LEFT
RIGHT

1

Label the cartridge casings as centerfire or rimfire.

Firearms and Ballistics Biweekly Check-in

The spiral pattern cut into the bore consists of raised areas called __________ and depressions called __________.

Explain why GSR cannot be used to connect a suspect to a weapon used in commission of a crime.

Categorize the following breechface impression!

Categorize the bullets as left twist or right twist.

The spiral pattern cut into the bore consists of raised areas called __________ and depressions called __________.

Explain why GSR cannot be used to connect a suspect to a weapon used in commission of a crime.

Examine the following bullet and note its dimensions:- 6 lands/grooves- cut rifling- groove width = 0.037 - 0.041 inches- land width = 0.188 - 0.190 inchesCheck the "show your work" section and select all of the possible firearm manufacturers from the list below:

Categorize the following breechface impression!

Categorize the bullets as left twist or right twist.

The spiral pattern cut into the bore consists of raised areas called and depressions called .

The spiral pattern cut into the bore consists of raised areas called and depressions called .

Examine the following bullet and note its dimensions:
- 6 lands/grooves
- cut rifling
- groove width = 0.037 - 0.041 inches
- land width = 0.188 - 0.190 inches

Check the "show your work" section and select all of the possible firearm manufacturers from the list below: