Rimfire and centerfire describe where the primer is located in a cartridge. In rimfire ammunition, the priming compound is inside the rim around the base of the case. In centerfire ammunition, the primer is a separate component seated in the center of the case head. That design difference affects common uses, reliability, cartridge size, cost, and whether the case can usually be reloaded.
The most important rule is simple: use only the exact ammunition listed for your firearm. Rimfire and centerfire cartridges are not interchangeable, and similar-looking ammunition can still be unsafe. Check the firearm markings, owner’s manual, and ammunition box before loading anything.
Table of contents
Quick Answer
Choose rimfire when your firearm is chambered for rimfire ammunition, such as many .22 LR rifles and pistols used for plinking, training, and small-game use where legal. Choose centerfire only when your firearm is chambered for a centerfire cartridge. Centerfire cartridges cover most modern handgun, rifle, and shotgun applications and are generally available in a wider range of power levels and bullet types.
Neither system is automatically better for every shooter. The correct answer depends on the firearm chambering, intended use, recoil tolerance, budget, range rules, and local laws.
What Is Rimfire Ammunition?
Rimfire ammunition places the priming compound inside the rim of the cartridge case. When the firing pin strikes the rim, it crushes that rim and ignites the priming compound. That ignition starts the powder burn and sends the bullet down the barrel.
The most familiar rimfire cartridge is .22 LR. It is popular because it is usually mild in recoil, commonly available, and useful for basic marksmanship practice. Rimfire cases are thin at the rim by design, which is one reason rimfire ammunition is usually limited to smaller, lower-pressure cartridges compared with many centerfire options.
Rimfire Strengths
- Often lower recoil than many centerfire cartridges.
- Commonly used for beginner practice and target shooting.
- Usually less expensive per round than many centerfire options.
- Works well for firearms specifically chambered for rimfire cartridges.
Rimfire Limits
- Not interchangeable with centerfire ammunition.
- Usually not practical to reload.
- Generally limited to smaller, lower-pressure cartridges.
- Can be more sensitive to rim damage or inconsistent priming than centerfire designs.
What Is Centerfire Ammunition?
Centerfire ammunition uses a separate primer seated in the center of the cartridge base. The firing pin strikes that primer, the primer ignites the powder, and the cartridge fires. This design is used in many modern rifle and handgun cartridges and in shotshell primers.
Centerfire cartridges cover a wide range of sizes and uses, from common handgun cartridges to hunting rifle cartridges. Because the primer is separate and the case design can be stronger, centerfire ammunition is generally better suited to higher-pressure cartridges than rimfire ammunition. Reloading is also possible for many centerfire cases, but only with proper equipment, published data, and strict safety practices.
Centerfire Strengths
- Available in a wider range of cartridge sizes and power levels.
- Common for hunting, range, defensive, and competition firearms.
- Usually more robust for higher-pressure cartridges.
- Many centerfire cases can be reloaded by trained reloaders using published load data.
Centerfire Limits
- Often costs more per round than common rimfire ammunition.
- Can produce more recoil and noise depending on cartridge.
- Requires careful cartridge matching because similar names can be confusing.
- Reloading mistakes can be dangerous, so beginners should not improvise.
Rimfire vs Centerfire Comparison
| Factor | Rimfire | Centerfire |
|---|---|---|
| Primer location | Inside the cartridge rim | Separate primer in the center of the case head |
| Common example | .22 LR | Many handgun, rifle, and shotgun cartridges |
| Typical recoil | Often mild in common rimfire rounds | Varies from mild to heavy by cartridge |
| Reloading | Usually not practical | Possible for many cases with proper data and equipment |
| Best fit | Training, plinking, small-game use where legal | Broader hunting, range, defensive, and competition uses |
The table is a starting point, not a permission slip to mix ammunition. SAAMI maintains a useful warning list for unsafe firearm and ammunition combinations, which is a good reminder that cartridge names and dimensions must be checked carefully.
Common Uses
Rimfire ammunition is often used for beginner marksmanship, informal target shooting, small-game hunting where legal, and low-recoil practice. Centerfire ammunition is used across a wider range of firearms and tasks, including hunting, formal range training, competition, and other lawful uses. The right choice is always the cartridge your firearm is designed to use.
If you are choosing ammunition for a hunting firearm, check local regulations and match the cartridge to the game, firearm, and ethical shot distance. Our guide on choosing the right ammunition for your firearm explains the decision process in more detail.
Ammunition Safety Checks
Before loading any firearm, confirm the cartridge marking on the barrel or receiver, check the owner’s manual, inspect the ammunition box, and look for damage, corrosion, or mixed rounds. The NSSF firearm safety rules still apply: keep the muzzle in a safe direction, keep your finger off the trigger until ready to shoot, and treat every firearm with respect.
Never rely on appearance alone. Some cartridges look similar but are not safe substitutes. If you are not sure, stop and ask a qualified instructor, gunsmith, range officer, or the firearm manufacturer. For storage and transport, see our ammunition storage and transport guide.
Choosing The Right Type
For a beginner, the best path is to choose the firearm first, then buy ammunition that exactly matches that firearm. Do not buy ammunition because it is cheap, common, or recommended online unless it matches the chambering and the manual. If you are using ammunition for hunting, check state rules and use suitable loads for the game and conditions.
For range practice, rimfire can be useful because it is mild and often affordable. For broader hunting or centerfire firearm practice, centerfire ammunition may be necessary. Either way, reliable training matters more than arguing that one ignition system is universally superior. Our shooting range safety rules guide is a good next read before live-fire practice.
FAQ
Is rimfire or centerfire better?
Neither is better for every use. Rimfire is often useful for low-recoil practice and small-caliber firearms. Centerfire covers a wider range of power levels and firearm types. The correct choice is the ammunition your firearm is chambered to use.
Can rimfire ammunition be reloaded?
Rimfire ammunition is generally not practical to reload because the priming compound is in the rim. Centerfire cases are commonly reloaded by trained reloaders, but only with proper equipment, published load data, and strict safety practices.
Can rimfire and centerfire ammunition be used interchangeably?
No. Rimfire and centerfire ammunition are not interchangeable. Always use the exact cartridge listed on the firearm and in the owner’s manual.
Why is centerfire so common?
Centerfire design supports a wide range of cartridge sizes and pressure levels, which makes it common in many modern rifles, handguns, and shotshells. It also allows many cases to be reloaded when done properly.
Is rimfire good for beginners?
Rimfire can be helpful for beginners because many rimfire firearms have mild recoil and lower ammunition cost. Beginners still need safety instruction, eye and ear protection, and close attention to firearm and ammunition compatibility.
Final Takeaway
Rimfire places the primer in the rim; centerfire places the primer in the center of the case head. Rimfire is common for mild, small-caliber practice, while centerfire covers a broader range of firearm uses. The safest choice is always the exact ammunition your firearm is designed to use, confirmed by the firearm markings, owner’s manual, and ammunition box.