Marksmanship Fundamentals & Ballistics Flashcards

What is 'muzzle velocity' and why is it relevant to a handgun instructor teaching ballistics?

Answer: The speed of the projectile as it leaves the barrel; it determines energy, trajectory, and terminal performance

Muzzle velocity is the speed of the bullet as it exits the barrel and directly influences kinetic energy, trajectory drop, and how the round performs on target.

Terminal ballistics in handgun instruction refers to:

Answer: What happens when a projectile strikes and interacts with the target medium

Terminal ballistics studies how a projectile behaves upon impact with a target, including penetration, expansion, and energy transfer.

Which of the following ammunition types is most commonly recommended for self-defense carry by instructors teaching civilian handgun courses?

Answer: Jacketed hollow point (JHP) for controlled expansion and reduced over-penetration risk

JHP ammunition is widely recommended for self-defense because it expands upon impact, transferring energy efficiently while reducing the risk of over-penetration.

What is 'point of aim vs. point of impact' (POA/POI) and why must instructors understand it?

Answer: POA is where the sights are directed; POI is where the bullet actually strikes — differences indicate sight adjustment needs

Understanding POA/POI discrepancy allows instructors to diagnose whether low-hitting shots reflect a sight adjustment issue versus a technique problem.

What does 'bullet drop' mean, and at what distances does it typically become significant for handgun cartridges?

Answer: Bullet drop is the downward arc of a projectile due to gravity; it becomes measurable beyond 25–50 yards for most handgun rounds

Gravity causes bullets to drop in an arc after leaving the muzzle, and for handgun cartridges this becomes practically significant at distances beyond 25–50 yards.

What is the purpose of understanding 'sectional density' (SD) when selecting defensive handgun ammunition?

Answer: SD measures a bullet's mass relative to its diameter, indicating its ability to penetrate and retain momentum through barriers

Sectional density reflects the bullet's mass-to-diameter ratio, which predicts how well it will penetrate and maintain stability through tissue or barriers.