GSI GSI Ammunition & Ballistics 1 — Questions and Answers
Question 1: What does the term 'caliber' refer to when describing ammunition?
- The weight of the bullet in grains
- The diameter of the bullet or bore in inches or millimeters (Correct answer)
- The length of the cartridge case
- The amount of powder charge in the cartridge
Correct answer: The diameter of the bullet or bore in inches or millimeters
Caliber refers to the internal diameter of the barrel bore or the diameter of the bullet, expressed in inches or millimeters.
Question 2: Which component of a cartridge contains the chemical compound that ignites the propellant powder?
- Bullet
- Case
- Primer (Correct answer)
- Wad
Correct answer: Primer
The primer is a small cup containing a sensitive explosive compound that ignites when struck by the firing pin, which then ignites the powder.
Question 3: What is the term for the distance a bullet travels from the muzzle to the target?
- Trajectory
- Range (Correct answer)
- Muzzle velocity
- Ballistic coefficient
Correct answer: Range
Range is the measured distance between the firearm's muzzle and the target downrange.
Question 4: Which type of bullet construction is most commonly recommended for personal defense due to controlled expansion?
- Full metal jacket (FMJ)
- Hollow point (HP) (Correct answer)
- Round nose lead (RNL)
- Wadcutter
Correct answer: Hollow point (HP)
Hollow point bullets are designed to expand upon impact, transferring energy efficiently and reducing over-penetration risk, making them popular for self-defense.
Question 5: What does 'muzzle velocity' measure?
- The rotational spin of the bullet
- The speed of the bullet as it exits the barrel (Correct answer)
- The recoil energy felt by the shooter
- The pressure generated inside the chamber
Correct answer: The speed of the bullet as it exits the barrel
Muzzle velocity is the speed of the projectile at the moment it leaves the muzzle of the barrel, typically measured in feet per second (fps).
Question 6: What is the purpose of the crimp on a completed cartridge?
- To seal the primer in place
- To secure the bullet in the case mouth and ensure consistent powder ignition (Correct answer)
- To add weight to the projectile
- To mark the caliber designation
Correct answer: To secure the bullet in the case mouth and ensure consistent powder ignition
Crimping secures the bullet in the case mouth, prevents bullet movement during recoil or feeding, and promotes uniform powder ignition for consistent ballistic performance.
GSI GSI Ammunition & Ballistics 1
What does the term 'caliber' refer to when describing ammunition?