Gunshots

Question 1

What do smooth bore weapons fire?

Answer 1

Multiple pellets e.g. shotgun

Question 2

What kind of weapojn is a handgun?

Answer 2

Rifled

Question 3

Give examples of interior ballistics?

Answer 3

1. Rifling karks on bullet: class characteristics for make/model, individual for unique to gun
2. Cartridge case
3. Primer cap/firing pin
4. Fingerprints

Question 4

What makes up primer in small arms?

Answer 4

Lead. barium and antimony

Question 5

What types of primer are there?

Answer 5

Centre fire and rim fgire

Question 6

What makes up propellant

Answer 6

Smokeless poweder:: nitrocellulose plus/mins nitroglycerine

Question 7

When are lead bullets used?

Answer 7

In revolvers and 22 rimfire cartridgres

Question 8

What kind of lead bullets are available?

Answer 8

Round nose#Wadcutter and hollow point

Question 9

What are jacketed bullets used in?

Answer 9

Autoloading pistols and HV rifles

Question 10

What kind of types of jacketed bullets exist?

Answer 10

Full metal jacket (HV military rifle)
Partial metal jacket (hunting and autoload pistol)
Semi-jacketed hollow soft point (hunting)
Silvertip (al)

Question 11

What kind of wound do bullets cause?

Answer 11

Direct laceration

Question 12

Explain temporary cavity?

Answer 12

lasts 800 m/s
Wide zone of haemorrhage around permanent cavity
Dense inelastic organ (liver) may rupture

Question 13

With a pistol: how far out does the flame go?

Answer 13

3 inches

Question 14

With a pistol: how far out does the smoke go?

Answer 14

6 inches

Question 15

With a pistol: how far out does the tattooing go?

Answer 15

18 inches

Question 16

When bullet enters and exits what is hole size like?

Answer 16

Small on entry, big on exit

Question 17

What size are temporary cavities?

Answer 17

30-40 times that of bullet, tremendous pressure and lasts milliseconds

Question 18

What causes tattooing?

Answer 18

Propellant

Question 19

At contact range, what is seared into margins?

Answer 19

Soot and propellant

Question 20

Between contact and intermediate range what occurs?

Answer 20

No tattooing, soot and propellant seared into margins and peripheral ring of soot staining (soot reaches 20-30cm and can be wiped off)1

Question 21

Whast is intermediate range?

Answer 21

Few cm to 1m (within arms readch)

Question 22

What do yoy get at intermediate range?

Answer 22

Powder tattooing: unburt propellany, individual reddish brown punctate abrasions, rim of bruising (vital reaction ), eccentric pattern if angled entry, raches up to 30-45 cm

Question 23

What is distant range?

Answer 23

Beyond arms length so beyond 1m

Question 24

What do you see at distant range?

Answer 24

No propellant, flame or soot, bullet is on its own, skin defect with marginal abrasion

Question 25

Compare entry vs exit: shape of defect?

Answer 25

Entry: circular
Exit: irregular

Question 26

Compare entry vs exit: diamter?

Answer 26

Entry: less than bullet
Exit: wider than bullet

Question 27

Compare entry vs exit: abrasions?

Answer 27

Entry: abraded margin
Exit: no abrasion (shored)

Question 28

Where are gunshot residues deposited

Answer 28

On radial side of firing hand