The Secrets of Gunpowder

Because not all propellants are created equally...

by
posted on April 26, 2023
gunpowder-how-it-works-f.jpg
Gunpowder is a flammable solid that stores chemical energy. When ignited, it releases that stored chemical energy in the form of hot, rapidly expanding gas. In a firearm, propellants do not explode; rather, they deflagrate or burn rapidly. The rate of deflagration is what separates smokeless propellants from true explosives. An explosive may be defined as an energetic substance that deflagrates at velocities greater than 4,000 feet per second (f.p.s.). Smokeless propellants deflagrate at much slower velocities than that. There are three principal types of propellant powders:

1. Blackpowder
Blackpowder is a physical mix of three ingredients in the following proportions: charcoal (15 1/2 percent); sulphur (10 1/2 percent); and potassium nitrate (74 percent). 

2. Semi-Smokeless
This type of propellant is a mixture of smokeless and blackpowder. It was used in early .22 rimfire ammunition, but has been obsolete since the late 1930s.

3. Smokeless Powder
This is a chemical mix of various ingredients that locks chemical energy into the molecular structure of the material. The main feed stock of smokeless powder is nitrocellulose obtained from either wood (good) or cotton (best).

There are three main types of smokeless powder:

1. Single-Base
The main ingredient in single-base smokeless powder is nitrocellulose. Examples include most IMR stick powders. Single-base propellants are a popular choice for many non-magnum rifle and handgun loads.

2. Double-Base
The nitrocellulose base is enhanced by the addition of 2 to 39 percent nitroglycerin. Examples include ball powders and Bullseye flake powder. Double-base propellants are a popular choice for many handgun and shotgun loads, as well as most rimfire ammunition.

3. Triple-Base
Nitroguanidine is added to double-base powder to increase the energy content even more. Examples include propellants for tank guns and artillery. This type of propellant is not often used in small-arms ammunition.

In addition to nitrocellulose and nitroglycerin, smokeless powder has several other ingredients, including: solvents, stabilizers, flash inhibitors, deterrent surface coatings, anti-static surface coatings and inert identity markers. Perhaps the most important of the above are the deterrent coatings that serve to help control the deflagration (or burning) rate along with the shape and size of the powder granules.

Latest

Daniel Defense Sherp Giveaway
Daniel Defense Sherp Giveaway

How to Win Guns & Gear at the NRA Annual Meetings

The short answer is "show up and walk around the exhibit hall," and the longer answer is below (yes, you still want to read it).

Show Ponies! 3 Annual Meetings Booths with Crazy Custom Colts

Calling all Colt fans: These three booths have the tricked-out Colt guns of your dreams.

First Impressions: Dead Air X Ruger RXD Series Suppressors

Two legendary manufacturers team up to create an all-new line of suppressors.

First Impressions: Taurus 58 Pistol

Smart design, modern materials, and high capacity come together for an ideal option for EDC (Everyday Carry) and range use alike.

Caught in a Staredown: What to Do

Uh-oh! The animal you're hunting saw you ... but you might still have a chance if you follow these tips.

First Impressions: Henry Repeating Arms HUSH Series Rifles

Fresh out of Henry's Special Products Division, these rifles are optimized for suppressors.

Interests



Get the best of NRA Family delivered to your inbox.