Rimfire vs. Centerfire Ammo: What’s the Difference?
If you’re new to firearms or simply need a refresher, understanding the difference between rimfire and centerfire ammo is a good place to start. The two ammunition types use different ignition systems, and that difference affects everything from reliability and recoil to cost, hunting applications, and whether the cartridge can be reloaded.
Neither type is universally better. Rimfire ammunition is generally associated with lower-recoil shooting, practice, and small-game applications, while centerfire ammunition is used across a much wider range of handgun and rifle calibers. Knowing how each system works makes it easier to understand which type is appropriate for a particular shooting application.
What Is a Round of Ammunition?
Whether it’s rimfire or centerfire, a complete round is properly called a cartridge. The bullet is only one component of that cartridge.
A typical cartridge consists of four primary components:
- Case: The container that holds the primer, propellant, and bullet.
- Primer: The ignition component that starts the firing sequence.
- Propellant: The powder that produces expanding gas when ignited.
- Bullet: The projectile that travels through the barrel.
When the firearm’s firing mechanism strikes the primer, the primer ignites the propellant. The resulting gas pressure pushes the bullet out of the case and through the barrel.
The fundamental difference between rimfire and centerfire ammunition is what happens at the primer.
Rimfire vs. Centerfire: How the Ignition Systems Differ
The names tell you where the ignition system is located.
With rimfire ammunition, the priming compound is contained within the hollow rim of the cartridge case. The firing pin strikes the rim, crushing the priming compound and initiating ignition.
With centerfire ammunition, the primer is housed in a separate metal cup positioned in the center of the cartridge case head. The firing pin strikes this primer to initiate the firing sequence.
That seemingly small difference has major implications for ammunition design, manufacturing, reliability, and reloading.
Rimfire Ammo
Rimfire cartridges have their priming compound distributed around the inside of the case rim rather than in a separate primer.
The most familiar example is .22 Long Rifle (.22 LR), which is widely used for recreational shooting, training, and small-game applications. Another well-known rimfire cartridge is .17 HMR.
Rimfire ammunition is generally associated with relatively low recoil and lower operating pressures compared with many centerfire cartridges. Those characteristics make it particularly popular for applications where economical shooting and manageable recoil are important.
One of its biggest limitations is the construction of the cartridge case. Because the rim contains the priming compound and is struck during firing, a fired rimfire case is not designed to be reloaded in the same way as a typical centerfire case.
Centerfire Ammo
Centerfire ammunition uses a separate primer positioned in the center of the cartridge case head.
When the firing pin strikes the primer, the primer compound produces the ignition needed to ignite the propellant. This design is used across the vast majority of modern handgun and rifle ammunition.
Common centerfire examples include 9mm for handguns and 5.56/.223 for rifles, along with numerous other handgun and rifle calibers.
Centerfire ammunition is generally available across a much broader range of cartridge sizes and performance levels. It also offers an important advantage for reloaders: fired cases can generally be collected and reloaded when the case and components are suitable for that purpose.
Boxer vs. Berdan Primers
Centerfire ammunition commonly uses one of two primer designs: Boxer or Berdan.
A Boxer primer uses a single flash hole in the center of the case and incorporates the anvil into the primer itself. A Berdan primer uses two or more flash holes and has the anvil incorporated into the cartridge case.
Both systems have been used extensively, although Boxer-primed ammunition is particularly common in the United States.
For reloaders, the distinction matters because Boxer-primed cases are generally easier to process using commonly available reloading equipment.
Rimfire vs. Centerfire: 6 Factors to Consider
There isn’t a single winner when comparing rimfire and centerfire ammunition. The better choice depends on what you’re trying to accomplish.
Here are six of the most important differences to understand.
1. Reliability
Centerfire ammunition generally has an advantage in reliability because the primer is a separate, purpose-built component located in the center of the case head.
Rimfire ammunition places the priming compound inside the cartridge rim, which makes the manufacturing process more sensitive to the uniform distribution of that compound.
That doesn’t mean quality rimfire ammunition is inherently unreliable. Rimfire cartridges are widely used for recreational shooting, training, and hunting. However, centerfire ammunition is generally preferred when consistent ignition is a particularly important consideration.
2. Recoil and Practical Accuracy
Recoil can have a significant effect on a shooter’s ability to maintain consistent aim.
Rimfire cartridges generally produce relatively little recoil, making them easier to shoot comfortably for extended sessions. This can also make them useful for introducing new shooters to fundamental shooting skills without the heavier recoil associated with more powerful cartridges.
Centerfire ammunition covers a much wider range of performance levels, so recoil varies considerably from one caliber and load to another.
At longer distances, cartridge performance also becomes increasingly important. Rimfire projectiles are generally lighter and can be more affected by environmental conditions such as wind, while many centerfire cartridges are designed for greater velocity and longer-range performance.
3. Experience Level
Rimfire ammunition can be particularly useful for beginners because of its generally mild recoil and relatively low ammunition cost.
That combination allows new shooters to concentrate on fundamentals such as a consistent shooting position, sight alignment, trigger control, and safe firearm handling.
Centerfire ammunition becomes more relevant as shooters move into the much broader range of handgun and rifle applications it supports.
Experienced shooters often use both types. Rather than viewing rimfire and centerfire as competing systems, it makes more sense to think of them as tools suited to different purposes.
4. Hunting Applications
Rimfire ammunition is commonly associated with small-game hunting because cartridges such as .22 LR provide an economical option for appropriate small-game applications.
Centerfire ammunition covers a much broader spectrum. Different centerfire cartridges are designed for everything from small and medium game to larger game and longer-range applications.
The important consideration is always matching the cartridge to the intended game, local regulations, and the specific hunting situation.
Using an unsuitable cartridge simply because it can technically produce enough energy is not a substitute for choosing ammunition appropriate to the intended application.
5. Cost and Reloading
One of the biggest advantages of rimfire ammunition is its relatively low cost per round.
That makes cartridges such as .22 LR popular for high-volume recreational shooting and practice.
The trade-off is that conventional rimfire cases are not intended to be reloaded. Their construction makes them fundamentally different from reloadable centerfire cases.
Centerfire ammunition generally costs more per round, but fired cases can often be collected and reloaded. For shooters who consume large quantities of ammunition, reloading can potentially reduce the long-term cost per round while also allowing experienced reloaders to tailor ammunition to particular applications.
Reloading should always be performed with appropriate equipment, components, and published load data.
6. Boxer vs. Berdan Primers for Reloaders
If you’re interested in reloading centerfire ammunition, understanding primer design becomes particularly important.
| Factor | Boxer Primer | Berdan Primer |
|---|---|---|
| Flash holes | Single | Typically two |
| Common U.S. availability | Widely available | Less common |
| Reloading | Generally easier | Generally more involved |
| Anvil | Part of primer | Part of case |
| Common use | Very common in U.S. commercial ammunition | Common in many military and imported cartridges |
For many U.S. reloaders, Boxer-primed cases are the more convenient option because the cases are generally easier to process with commonly available equipment.
Berdan-primed cases can be reloaded, but doing so generally requires different techniques and equipment.
Rimfire vs. Centerfire Pros and Cons
| Rimfire | Centerfire | |
|---|---|---|
| Main advantages | Low recoil, economical, beginner-friendly | Broad caliber selection, reliable ignition, higher performance range |
| Common applications | Practice, recreation, small-game hunting | Handguns, rifles, hunting, defensive and sporting applications |
| Recoil | Generally low | Varies widely by caliber |
| Reloadable | No | Generally yes |
| Cost | Generally lower | Generally higher |
| Caliber selection | More limited | Extremely broad |
| Long-range potential | Generally limited | Broad range of long-range options |
The table gives you the basic picture, but the important point is that ammunition should be evaluated according to its intended use rather than simply by whether it is rimfire or centerfire.
Which Is Better for Beginners?
For many new shooters, rimfire ammunition offers an accessible starting point.
Low recoil makes it easier to concentrate on fundamentals without immediately dealing with the sharper recoil of more powerful centerfire cartridges. The relatively low ammunition cost can also make frequent practice more practical.
That doesn’t mean beginners should avoid centerfire ammunition. Many people begin with centerfire firearms, and the appropriate starting point depends on the firearm, cartridge, individual shooter, instruction, and intended application.
The most important consideration for a new shooter is learning safe handling and developing sound fundamentals under appropriate supervision.
Which Is Better for Hunting?
The answer depends primarily on the game.
Rimfire cartridges are commonly used for suitable small-game applications, where their lower cost, lower recoil, and relatively modest performance can be appropriate.
Centerfire cartridges offer far greater flexibility because they are available in a much wider range of bullet weights, velocities, and cartridge configurations. That makes them the more versatile choice for hunters pursuing larger game or hunting at greater distances.
Always check local hunting regulations and cartridge requirements before heading into the field.
Can Rimfire Ammo Be Reloaded?
Conventional rimfire ammunition is not designed to be reloaded.
The primer is incorporated into the cartridge rim rather than installed as a separate component. Once the cartridge has been fired, the case is not intended to be processed and reprimed like a conventional centerfire case.
Centerfire cases, by contrast, are designed around a replaceable primer system, which is what makes conventional centerfire reloading possible.
Why Is Centerfire Ammo More Common?
Centerfire ammunition offers several practical advantages that make it suitable for a huge range of applications.
The separate primer design supports cartridges operating across a much broader range of pressures and dimensions. Manufacturers can produce centerfire ammunition for everything from compact handgun cartridges to large rifle cartridges.
The cases can also generally be reloaded, adding another advantage for shooters who reload their own ammunition.
As a result, centerfire ammunition dominates most modern handgun and rifle categories.
Frequently Asked Questions
What’s the main difference between rimfire and centerfire ammo?
The primary difference is the location of the primer. Rimfire ammunition contains its priming compound inside the cartridge rim, while centerfire ammunition uses a separate primer positioned in the center of the case head.
Is rimfire or centerfire better for beginners?
Rimfire is often a good starting point for beginners because its relatively low recoil makes it easier to focus on basic shooting fundamentals. The best choice still depends on the individual shooter and the intended application.
Can rimfire ammo be reloaded?
No. Conventional rimfire cartridges are not designed for reloading because their ignition system is incorporated into the cartridge rim.
Is centerfire ammo more reliable than rimfire?
Centerfire ammunition generally offers more consistent ignition because it uses a separate primer. However, ammunition quality and firearm condition also play important roles in reliability.
Which is cheaper, rimfire or centerfire ammunition?
Rimfire ammunition is generally less expensive per round, which is one reason it is popular for recreational shooting and high-volume practice.
Should reloaders choose Boxer or Berdan primers?
Boxer-primed cases are generally more convenient for many U.S. reloaders because they are widely available and easier to process with common reloading equipment.
Final Thoughts
Rimfire and centerfire ammunition are built around different ignition systems, and each has a useful place in shooting.
Rimfire ammunition stands out for its low recoil, relatively low cost, and suitability for recreational shooting, training, and appropriate small-game applications. Centerfire ammunition offers a much broader selection of calibers and performance levels, along with the ability to reload many fired cases.
The best choice ultimately comes down to the job at hand.
If you’re learning the fundamentals or looking for economical ammunition for recreational shooting, rimfire can be an excellent fit. If you need a wider range of cartridge options, higher performance, or reloadable cases, centerfire provides considerably more flexibility.
Understanding the difference between the two gives you a better foundation for making informed ammunition choices and understanding why different cartridges are designed the way they are.