ZAUF: Introduction to Bullet Types

Let’s get back to bullets. There are many different kinds of bullets available on the market today as well as a wide variety of cartridges which utilize these bullets. The anatomy of a cartridge, which we glossed over earlier, consists of 4 major components: the casing, the bullet, the gunpowder, and the primer.

Bullets come in a wide variety of shapes and sizes, even within the families of specific calibers. For our introduction, I’m going to split it into 3 very general categories: Full metal jacket, hollow point, and other - since that’ll be what you see the most in stores.

Full Metal Jacket (FMJ), as the name implies, means that the bullet (normally cast from lead [Pb]) is coated in a jacket (most commonly copper [Cu]) that leaves the base of the bullet exposed. For the most part FMJ bullets are the most common bullet types you’ll encounter on the market.

Full Metal Jacket
Source: Wikimedia Commons

Jacketed Hollow Point (JHP) bullets are true to their name, with a hollow cavity in the nose of the bullet that exposes the lead core and allows the projectile to expand on impact, increasing the terminal damage of the projectile through soft targets. The downside of this is that against even lightly armored targets, the expansion reduces the overall effectiveness of this ammunition type.

Jacketed Hollow Point
Source: Wikimedia Commons

The ‘Other’ category of ammunition covers everything from non-jacketed ammunition to extremely specialized ammunition such as Glaser Safety Slugs and snake shot (also known as rat shot). Almost all non-jacketed ammunition will lack the copper jacket the previous two categories sport and can come in a variety of shapes and purposes. For consumer purposes, these different types of specialized ammunition will become viable with experience and actual use cases.

Glaser Safety Slug
Source: Wikimedia Commons

For the examples listed above, non-jacketed reloaded ammunition can be found as an alternative to regular; Glaser Safety Slugs are a special type of bullet with a core made up of loose No. 12 birdshot capped with a polymer tip to prevent over penetration; finally snake shot (or rat shot) is fairly self-explanatory, with different caliber loads meant to be viable against snakes and vermin.

Snake shot/Rat shot
Source: Wikimedia Commons

ZAUF: Types of Firearms

Now that there’s enough information to know how to read and have a basic understanding of caliber, let us move on to the firearms themselves. On the whole, firearms are split between handguns and long guns. The names themselves are fairly self-explanatory; handguns are designed to be fired in one or both hands and are generally much smaller and shorter than long arms. On the other hand, long arms are designed to be held in both hands and braced against the shoulder when fired.

Now for something slightly more technical - handguns are subdivided into two different categories: pistols and revolvers. The term ‘pistol’ implies that the chamber is integral with the barrel, meaning the term covers most modern semiautomatic handguns. Revolvers in contrast have a revolving cylinder (hence the name) which contains multiple chambers and at least one barrel for firing them. While there are other odd firearms that have been made throughout history such as revolvers with multiple barrels and multiple cylinders, they are almost completely irrelevant in a modern discussion.

The major split of long guns in the parlance of small arms (because this series won’t be talking about artillery) is between rifles and shotguns. Rifles are defined by as well as named after their rifling: lands and grooves on the inside of the barrel which impart a spin onto the bullet as it travels through. This spin (much like on an American football) gives the bullet increased stability in flight, granting an increased effective range.

Shotguns are defined by two things: the ability to fire shot shells and their smooth bore. Unlike rifles, the bore of a shotgun is generally unrifled. This is because the behavior of shot shells is unlike that of other single bullet cartridges, and rifling would have no effect on these projectiles. Shotguns have what is called a choke (either fixed into the end of the barrel or swappable) that controls the spread of the pellets as they leave the barrel.

As always, there are exceptions and combinations to these general definitions. For example, some shotguns have a revolving mechanism to hold shot shells and are technically a revolver shotgun. There are also smaller subcategories and middling firearms classified in such categories as carbines or submachine guns which are even more refined divisions of the above general categories.

ZAUF: Clips, Magazines, and You

Following the common theme of ammunition, let’s take a look at how they’re loaded into a firearm. In the early days of single shot cannons and later on hand cannons and muskets, the process was excruciating: a shooter would have to load powder in through the muzzle (the business end), tamp it down, shove a wad and bullet in the gun and tamp that down, and then use a separate trigger activated fuse to fire. Thankfully, the invention of the fully encased metal cartridges we know and love has solved all of those problems and made possible for weapons to be magazine fed.

What is a magazine? It is a container where cartridges rest before being cycled into use. A magazine can be internal or removable. An internal magazine is fixed within the firearm itself, and cartridges are added by hand or with the help of a piece of metal called a clip. We’ll talk more about clips later, but the important point is that they are not magazines. Generally, removable magazines come in a few flavors, the most common of these is the box magazine. All that means is that it is boxy and rectangular. Other types of magazines include things such as helical drums that are significantly more common on shotguns and high capacity magazines.

There are generally two types of magazines that are in common use today: Single Stack and Double Stack. What does that mean? Within the body of the magazine the cartridges rest on top of each other in either a straight line or a staggered column. The straight line resting method is called a single stack for obvious reasons, and the staggered column is the double stack. The latter method allows more cartridges to fit into a magazine because of the staggered design.


ZAUF: Introduction to Caliber

The next part of our Zen and the Art of Understanding Firearms (ZAUF) series is still part of the introduction. This entry in the series will teach you what it means when people say “.45 Caliber”, “9 millimeter”, or “12 gauge”.

With these designators, it comes down to differences between the region of origin: American vs the rest of the world. When someone says “a 45” or “45 caliber”, what do they mean? 45 of what? 0.45 of an inch, of course. So what does that mean exactly? The width at the widest part of the given bullet is approximately .45 of an inch wide in diameter. We say “approximately” because if you wanted to extend significant figures out to the thousandths place and beyond you’ll quickly realize that the measurements aren’t quite what you’d expect. In the case of .45, some 45 caliber bullets are commonly .451 inches and others are .452. Common calibers that you’ll see referred to this way are .22, .357, .45, .44, and .50. What you may also see are calibers such as .30-06 (pronounced “thirty aught six” in this case), wherein there is a hyphen followed by another number. These hyphenated numbers are completely arbitrary and their meanings range anywhere from total powder charge meant for use with the cartridge or even the year the cartridge was adopted.

In a metric world with international standards, bullets are measured using millimeters, such as 7.62x51mm and 5.56x45mm, or 7.62x39mm. What do these two numbers mean? The first number is the same as the American method of reference, meaning the width of the bullet at the widest point. The second number is the length of the casing.

So what is a gauge? Most commonly you’ll see gauge used in reference to shotshell measurements for shotguns. The real definition of what a gauge is is tangentially related to a similar density measurement of iron ball fitting in cannons that ends up being fairly obscure and technical, so we’ll spare you that aspect of it. What you do need to know and keep in mind is that usually the smaller the number, the bigger the shell, E.g. 10 gauge > 12 gauge > 20 gauge. The notable exception to this is .410 shotshell, which is measured in the American style of caliber mentioned above.

Sometimes there are cartridges that are very similar, or are slightly modified versions of each other that are designed for shooting at different pressures and will have both types of designations. Two common examples of this are .223 Remington and 5.56x45mm as well as .308 Winchester and 7.62x51mm. These two sets of cartridges are almost identical, and depending on the firearm, they will have cross compatibility. However, there are nuances I’m glossing over right now that will be explored later, so keep in mind that while they’re often interchangeable, that’s not always the case.

Zen and the Art of Understanding Firearms

There’s a Zen koan that goes,

“Nan-in, a Japanese master during the Meiji era (1868-1912), received a university professor who came to inquire about Zen.

Nan-in served tea. He poured his visitor's cup full, and then kept on pouring.

The professor watched the overflow until he no longer could restrain himself. ‘It is overfull. No more will go in!’

‘Like this cup,’ Nan-in said, ‘you are full of your own opinions and speculations. How can I show you Zen unless you first empty your cup?’”


That serves as the foundation of any introduction to Zen and Zen Buddhist philosophy. While I won’t be attempting to teach you Zen here, I do recognize the fact that for many people, starting with tabula rasa is the best way to begin any form of education: free of preconceptions and prejudice.

That in mind, let’s begin this partnered meditation on firearms. What I hope to present to you, the reader, is a guide that contains all of the building blocks to understand, operate, and master firearms in general.

So beginning with nothing, the first topic that’d be best to cover is ammunition. What do guns shoot? The correct answer is bullets, but that’s a bit of a misnomer. What you’re most likely to find on sale in stores are technically cartridges. These cartridges are collections that involve a bullet, gunpowder, and a small explosive charge called a primer all wrapped up in a metal casing. These bullets can come in a variety of forms and names, but that’s for a later discussion. Similarly not all gunpowder is created equal. Nor are the primers the same across the multitude of different cartridges. To save time, though, the metal casing only really comes in a handful of different metal types.

The most common of these in modern production is brass. You’ll find brass casings commonly in modern production ammo and it is the de facto standard of modern ammunition. The second most common of these is steel. Steel cases tend to be a sign of Soviet and post-Soviet surplus ammunition, which has its own multitude of quirks that we can discuss later. Other less common and more brand-defined metals are aluminum and a much broader and more vague term called bi-metal which, as the name implies, consists of two different metals. A special note is given to shotgun shells, which are most commonly made with plastics these days, though there are ones made of solid brass.

So what happens to this whole cartridge in the process of actually shooting a gun? Once the trigger is pulled on any given firearm, something strikes the primer, which is a contact explosive. This primer ignites and causes the powder within the metal casing to burn. The burning of the powder creates gas and pressure, which pushes the bullet out of the top of the metal casing and out the barrel.

Simple, isn’t it?

Welcome to Not Operator

Henry Rifle .45LC

Welcome to Not Operator. We have started this website as a way for us to share our information, knowledge, and opinions on the topics of firearms and technology, as well as how and where they intersect. We plan on having anything from news, to in-depth analysis pieces, to highly charged opinion articles.

Our name, Not Operator, is a play on words for both technology and firearms. In computer science, the 'Not' operator (symbol: !) signifies the opposite of whatever is given. We aim to provide an alternate and non-standard look into the world of guns and tech. In the firearms world, the word 'Operator' is often synonymous with self righteous "tactical" or "tacticool" ways of thinking about firearms. We also refer to ourselves as Not Operator because we want to provide an unbiased, analytical approach to how we explore these topics.

We hope to help you, the reader, learn about firearms, technology, and everything in between. Welcome to Not Operator.