Full Metal Jacket Ammo Vs Hollow Point - Difference And Usage

Published on December 11, 2020
Duration: 10:18

This video from Big Daddy Unlimited, featuring Bill Quirk of Defensive Training Group, provides an expert comparison between Full Metal Jacket (FMJ) and Jacketed Hollow Point (JHP) ammunition. It details their distinct uses for training versus self-defense, emphasizing JHP's expansion for energy transfer and threat stopping, while cautioning about over-penetration risks with both types. The guide stresses the critical importance of reliability testing specific defensive ammunition in your firearm.

Quick Summary

JHP (Jacketed Hollow Point) ammunition is recommended for self-defense because its nose cavity is designed to expand upon impact, maximizing energy transfer to the target and increasing the likelihood of stopping a threat. This expansion also helps mitigate over-penetration risks compared to FMJ (Full Metal Jacket) rounds, which are better suited for training and typically penetrate deeper.

Chapters

  1. 00:00Introduction: FMJ vs JHP Ammo
  2. 00:25FMJ Characteristics & Use
  3. 00:54JHP Characteristics & Use
  4. 01:30FMJ vs. JHP: Penetration & Energy Transfer
  5. 05:00JHP for Self-Defense: The CYA Principle
  6. 06:00Over-penetration Risks Explained
  7. 07:00Firearm Reliability Testing with JHP
  8. 08:25Accuracy & Point of Impact Variance

Frequently Asked Questions

What is the primary difference between FMJ and JHP ammunition?

FMJ (Full Metal Jacket) ammo is typically used for training and has a full metal jacket over a lead core, designed for reliable feeding. JHP (Jacketed Hollow Point) ammo is designed for self-defense; it features a hollow cavity in the nose that expands upon impact, dumping more energy into the target.

Why is JHP ammunition recommended for self-defense over FMJ?

JHP ammunition is recommended for self-defense because its expansion upon impact increases the likelihood of stopping a threat effectively by transferring more energy. This expansion also helps reduce the risk of over-penetration compared to FMJ rounds, which tend to penetrate deeper.

How important is it to test defensive ammunition in your firearm?

It is critically important to test your specific defensive ammunition in your firearm. Bill Quirk recommends firing 50 to 250 rounds to ensure the gun's feed ramp and cycling mechanics are compatible with the JHP projectile's shape for reliable performance.

Can FMJ ammunition over-penetrate a target?

Yes, FMJ ammunition can over-penetrate a target. No ammunition type guarantees against over-penetration. Shooters are legally responsible for every round fired, regardless of the ammunition type used, making safe backstops and target selection crucial.

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