Rimfire and centerfire show up in gun shop and range talk, but their names hide a simple idea: where the firing pin strikes the cartridge. In a rimfire round the primer is inside the rim, so the gun hits edge to fire.
In a centerfire round the primer sits in the center of the base and takes a direct hit. Those small design choices change a lot.
Rimfire ammo tends to be cheaper, lighter, and quieter, and works well for plinking and small game. Centerfire ammo is built to handle bigger pressures, so it fits larger calibers, offers more power, and is reloadable for people who handload.
If you know which type your gun uses, you’ll pick the right ammo, avoid damage, and get the results you want at range or in the field.
Read on to learn how each type works, its tradeoffs, and which fits your needs today.
The Basics: What Is Rimfire?
Rimfire ammo gets its name from where the primer sits — in the rim of the cartridge case. When the firing pin strikes that rim it crushes the primer compound, which lights the powder and sends the bullet downrange.
That simple design makes rimfire cartridges cheap to make and quiet to shoot, but it also limits how much pressure they can handle. For that reason rimfire is used for low-pressure rounds, the most common being .22 caliber.
Rimfire rounds are popular for target practice, teaching new shooters, and small-game hunting because they are light, affordable, and easy to use today.
What About Centerfire?
Centerfire cartridges put the primer in the center of the case head. When the firing pin hits that primer it ignites, setting off the powder and propelling the bullet.
Because the primer sits in a dedicated pocket, centerfire cases are stronger and can handle much higher pressures than rimfire designs.
That strength lets manufacturers build rounds with greater velocity and energy, which is why centerfire is standard for most pistols, rifles, and shotguns used by military, law enforcement, hunters, and many sports shooters.
Centerfire cases are usually reloadable, which adds flexibility for handloaders and serious range users and practical options.
A Look at the History of Rimfire
Rimfire ammo dates back to the mid-1800s. The .22 Short, introduced by Smith & Wesson in 1857, was one of the first successful rimfire cartridges and saw use in small revolvers during the Civil War.
Rimfire’s simple design made rounds cheaper and easier to mass-produce than early centerfire types, so it quickly gained favor for target shooting, plinking, and small-game hunting.
That early success set the stage for later rimfire rounds—the best known being the .22 Long Rifle, which arrived a few decades later and became wildly popular.
Even today, rimfire remains the go-to for affordable practice and basic field work.
Centerfire’s Rise to Popularity
Centerfire ammunition came into the picture not long after rimfire, and by the late 1800s, it became the dominant ammunition type. This shift occurred because centerfire cartridges could withstand higher pressures, allowing for more powerful rounds.
As firearms technology advanced, centerfire cartridges became the standard for hunting, military, and police firearms due to their reliability and power.
Why Rimfire Is Still Relevant
You might wonder why rimfire ammo is still used if centerfire is so much more powerful. The answer lies in rimfire’s unique strengths. Rimfire cartridges are generally cheaper to manufacture, and because they generate less pressure, they’re perfect for smaller caliber firearms.
For those interested in small game hunting or target shooting, rimfire offers a low-cost, low-recoil option that’s easy on both your shoulder and your wallet.
Centerfire’s Reliability Advantage
One of the key reasons shooters prefer centerfire ammunition is its reliability. The centralized primer in centerfire cartridges means that they are far less likely to misfire compared to rimfire.
In fact, rimfire rounds are more prone to fail-to-fire issues due to their design, as the primer must be spread across the entire rim. With centerfire, the single strike to the middle offers a more dependable firing mechanism.
Rimfire for Beginners and Training
Rimfire cartridges, particularly the .22LR, are often recommended for beginners. The reduced recoil and lower noise level make them less intimidating for new shooters.
Plus, they’re great for training because they cost much less than centerfire ammunition. Many firearm manufacturers even produce rimfire variants of popular guns like the AR-15 for cheaper practice sessions.
Centerfire for Power and Versatility
Centerfire ammunition dominates the self-defense and hunting markets. With higher pressures and more powerful rounds, centerfire cartridges are capable of handling big game hunting and protecting yourself in life-threatening situations.
Common centerfire calibers include 9mm, .45 ACP, and .223, all of which offer a range of options depending on your firearm and shooting needs.
The Reloading Factor
Another big advantage of centerfire ammunition is its reloadability. Since the primer is a separate component, once a centerfire casing is fired, it can be reloaded and used again by simply replacing the primer, powder, and bullet.
Rimfire cartridges, however, cannot be reloaded due to their one-piece design, making them a single-use option.
When Rimfire Falls Short
While rimfire ammo is great for certain applications, it does have its limitations. Because of the lower pressures, it’s not ideal for long-range shooting or situations where stopping power is crucial.
Rimfire rounds are also not known for their reliability in extreme conditions. If you’re looking for something for self-defense or big-game hunting, centerfire is usually the way to go.
Centerfire for Precision
For long-distance shooting, centerfire cartridges shine. Their higher velocity and consistent ignition make them more accurate at longer ranges. If you’re aiming to hit targets several hundred yards away, a centerfire cartridge like the .308 or .30-06 is a much better choice than any rimfire round.
Choosing the Right Ammo for Your Needs
So, which type of ammo should you choose – rimfire or centerfire? It all comes down to what you need it for. If you’re just plinking around in your backyard or looking to introduce someone to firearms, a rimfire gun like a .22 is perfect. But for self-defense, hunting, or any situation where reliability and power are essential, centerfire is the superior choice.
Both Have Their Place
In the end, both rimfire and centerfire ammunition play important roles in the shooting world. Rimfire is affordable, great for beginners, and perfect for small game hunting or training. Centerfire, with its power and reliability, is the gold standard for self-defense, law enforcement, and big-game hunting. Knowing the differences between these two types of ammo will help you make better choices for your shooting adventures.
Mark grew up in the heart of Texas, where tornadoes and extreme weather were a part of life. His early experiences sparked a fascination with emergency preparedness and homesteading. A father of three, Mark is dedicated to teaching families how to be self-sufficient, with a focus on food storage, DIY projects, and energy independence. His writing empowers everyday people to take small steps toward greater self-reliance without feeling overwhelmed.
