Firearm Basics: Understanding Information on an Ammo Box

Published on April 13, 2020
Duration: 6:34

This video from NRA Publications provides a comprehensive guide to understanding the information printed on ammunition boxes. It details how to interpret cartridge designations, bullet types (like Full Metal Jacket and Jacketed Hollow Point), bullet weights in grains, and even velocity and energy ratings, emphasizing that these are tested under specific conditions. The instruction is geared towards beginners seeking to identify and select the correct ammunition for their firearms.

Quick Summary

Ammunition boxes provide crucial details like cartridge designation (e.g., 9mm Luger), bullet type (e.g., Full Metal Jacket), and weight in grains. They may also list velocity and energy, though these are tested under specific conditions and can vary slightly in actual use.

Chapters

  1. 00:33Introduction to Ammo Box Information
  2. 01:23Understanding Cartridge Designation & Caliber
  3. 02:54Second Designation: Names and ACP
  4. 04:07Bullet Types: FMJ, JHP, and Proprietary Names
  5. 04:37Bullet Weight in Grains
  6. 05:31Cartridge Case Material
  7. 05:48Velocity and Energy Ratings
  8. 06:14Conclusion: Understanding Your Ammunition

Frequently Asked Questions

What information is typically found on an ammunition box?

An ammunition box usually indicates the cartridge's designation (like 9mm Luger), the type and weight of the bullet (e.g., 115 grain Full Metal Jacket), and sometimes the material of the cartridge case. It may also list the bullet's velocity and energy upon firing.

How is caliber used to designate ammunition?

Caliber primarily refers to the diameter of the bullet a cartridge uses, measured in millimeters or inches (as a decimal). However, ammunition isn't solely designated by caliber, as different cartridges can share similar bullet diameters but are not interchangeable.

What does 'grains' mean in relation to ammunition?

Grains are the standard unit of weight for bullets in the US system. Bullet weights are typically expressed in grains, with 7,000 grains making up one pound. For example, a common 9mm bullet might weigh 115 grains.

Are the velocity and energy ratings on an ammo box always accurate for my firearm?

The velocity and energy figures on an ammunition box are measured under specific, controlled circumstances. Your firearm's performance may vary slightly due to factors like barrel length and environmental conditions, but these ratings provide a general idea of the ammunition's potential.

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