The best ammo for AR-15 rifles depends on how you use your firearm. Whether you are practicing at the range, training regularly, competing, hunting, or building your ammunition supply, choosing the right 5.56 NATO or .223 Remington ammo helps you get the best performance from America’s most popular rifle platform.
The AR-15 is one of the most widely used semi-automatic rifles because of its reliability, customization options, and broad ammunition availability. Most AR-15 rifles are chambered for either 5.56 NATO, .223 Remington, or .223 Wylde, which gives shooters access to a large selection of rifle ammunition.
For most AR-15 owners, 55 grain and 62 grain FMJ ammunition provide the best balance of affordability, reliability, and accuracy for everyday training and range use.
What Ammo Does an AR-15 Use?
Most AR-15 rifles use:
5.56 NATO or .223 Remington ammunition
The exact cartridge compatibility depends on the rifle’s chamber specification.
| Specification | Details |
|---|---|
| Common Calibers | 5.56 NATO, .223 Remington, .223 Wylde |
| Common Bullet Weights | 55 grain, 62 grain, 69 grain, 77 grain |
| Firearm Type | Semi-automatic rifle |
| Common Uses | Training, range shooting, competition, hunting |
Always check your barrel markings before selecting ammunition.
5.56 NATO vs .223 Remington: What Is the Difference?
One of the most common AR-15 ammunition questions is:
Can an AR-15 shoot both 5.56 and .223?
The answer depends on the rifle chamber.
5.56 NATO
5.56 NATO ammunition is designed for military specifications and generally operates at higher pressure than .223 Remington.
Benefits:
- Designed for AR-15 platforms
- Wide availability
- Excellent reliability
- Common for training ammunition
.223 Remington
.223 Remington is a commercial rifle cartridge with similar dimensions but different pressure specifications.
Benefits:
- Often affordable
- Easy to find
- Excellent for range use
.223 Wylde Chamber
Many modern AR-15 rifles use .223 Wylde chambers because they are designed to handle both:
- 5.56 NATO
- .223 Remington
Always follow your firearm manufacturer’s recommendations.
Best Overall Ammo: 55 Grain 5.56 NATO FMJ
For most AR-15 owners, 55 grain 5.56 NATO FMJ ammunition is the best general-purpose option.
Benefits:
- Affordable
- Widely available
- Reliable feeding
- Good accuracy
55 grain ammunition is popular because it works well for high-volume shooting without excessive cost.
Ideal uses:
- Range training
- Target shooting
- General practice
- Carbine drills
Best Budget Ammo: Bulk .223 Remington
For shooters focused on affordable practice, bulk .223 Remington ammo is a popular choice.
Advantages:
- Lower cost per round
- Available in large quantities
- Reliable performance
- Good for range sessions
Bulk .223 ammunition is commonly used by:
- New AR owners
- High-volume shooters
- Recreational shooters
Best 62 Grain Ammo for AR-15
62 grain 5.56 NATO ammunition is another popular choice among AR-15 owners.
Benefits:
- Slightly heavier projectile
- Good balance of velocity and stability
- Popular military-style load
62 grain ammunition works well for shooters who want a heavier general-purpose load while maintaining good performance.
Best Ammo for AR-15 Range Training
The AR-15 is often used for high-volume training, making ammunition cost and consistency important.
Quality range ammunition helps improve:
- Trigger control
- Accuracy
- Shooting speed
- Rifle handling
Popular training choices include:
- 55 grain FMJ
- 62 grain FMJ
- Bulk 5.56 ammo
- Bulk .223 ammo
For most shooters, affordable FMJ ammunition provides the best value for regular practice.
Bulk 5.56 Ammo for AR-15 Rifles
Because AR-15 rifles are commonly used for high-round-count training, buying bulk ammunition is one of the most practical options.
Buying bulk 5.56 ammo helps:
- Reduce cost per round
- Increase training opportunities
- Maintain ammunition supply
- Avoid frequent purchases
Popular quantities include:
- 500 rounds
- 1,000 rounds
- Larger case quantities
For AR-15 owners who shoot regularly, bulk ammunition offers better long-term value.
How Much Ammo Should You Buy for an AR-15?
Your shooting habits determine how much ammunition makes sense.
Occasional Shooter
200–500 rounds
Good for occasional range visits.
Regular Shooter
1,000 rounds
A practical supply for ongoing training.
High-Volume Shooter
2,000+ rounds
Useful for:
- Carbine training
- Competition practice
- Frequent range sessions
AR-15 Ammo Buying Tips
Check Your Barrel Markings
Before buying ammunition, confirm whether your rifle is chambered for:
- 5.56 NATO
- .223 Remington
- .223 Wylde
This is the most important compatibility factor.
Choose the Right Bullet Weight
Common AR-15 bullet weights include:
| Bullet Weight | Common Use |
|---|---|
| 55 Grain | General training and range use |
| 62 Grain | General-purpose shooting |
| 69 Grain | Accuracy-focused shooting |
| 77 Grain | Precision applications |
Compare Cost Per Round
When buying ammunition, compare:
Total price ÷ number of rounds = cost per round
This helps identify the best bulk ammunition value.
55 Grain vs 62 Grain vs 77 Grain 5.56 Ammo
| Bullet Weight | Best Use |
|---|---|
| 55 Grain | Affordable practice |
| 62 Grain | General-purpose shooting |
| 77 Grain | Precision-focused shooting |
For most AR-15 owners, 55 grain provides the best combination of price and performance.
AR-15 Ammo for Different Uses
Range Shooting
Best choice:
- 55 grain FMJ
- 62 grain FMJ
Training
Best choice:
- Bulk 5.56 NATO
- Bulk .223 Remington
Competition
Common choices:
- 55 grain
- 69 grain
- 77 grain loads
Precision Shooting
Common choices:
- Heavier match-grade bullets
The best choice depends on barrel twist rate, shooting distance, and accuracy requirements.
AR-15 vs Other Popular Rifle Platforms
| Firearm | Ammo |
|---|---|
| AR-15 | 5.56 NATO / .223 Remington |
| AK-47 | 7.62x39mm |
| Ruger 10/22 | .22 LR |
| FN PS90 | 5.7x28mm |
| AR-10 | .308 Winchester / 7.62 NATO |
This makes 5.56 NATO and .223 Remington some of the most widely supported rifle cartridges available.
Frequently Asked Questions About AR-15 Ammo
What ammo does an AR-15 use?
Most AR-15 rifles use 5.56 NATO or .223 Remington ammunition.
Can an AR-15 shoot .223 and 5.56?
It depends on the chamber. Many 5.56 NATO and .223 Wylde rifles can safely use both. Always verify your firearm specifications.
What is the best ammo for AR-15 range shooting?
Most shooters choose 55 grain FMJ 5.56 or .223 ammunition because it provides affordable and reliable training.
Is bulk 5.56 ammo good for AR-15?
Yes. Bulk 5.56 ammo is one of the most popular choices for AR-15 owners because rifles are commonly used for high-volume shooting.
What grain ammo is best for AR-15?
For most shooters, 55 grain is the best all-around choice. Shooters seeking different performance characteristics may choose heavier bullets like 62 or 77 grain.
Shop Bulk 5.56 and .223 Ammo for AR-15 Rifles
The AR-15 remains one of the most popular rifle platforms because of its reliability, customization options, and affordable ammunition availability.
Choosing dependable 5.56 NATO and .223 Remington ammunition helps AR-15 owners train more effectively while keeping shooting costs manageable.
Explore Bulk Ammo To Go’s selection of bulk 5.56 ammo and bulk .223 ammo for AR-15 rifles, modern sporting rifles, and other firearms chambered in these popular calibers.