55 Grain vs. 62 Grain 5.56: What Changes for Range Use?
When shopping for 5.56 range ammo, 55-grain and 62-grain loads are two of the most common options you’ll encounter. Both are widely available, particularly in FMJ configurations, and both have a long history in 5.56 ammunition.
The difference is straightforward: a 62-grain bullet weighs seven grains more than a 55-grain bullet. But that small change can affect the ammunition’s velocity, trajectory characteristics, recoil impulse, and how a particular load behaves in an individual firearm.
That doesn’t make one weight universally better.
For range use, the more useful question is which specific load makes sense for your budget, range requirements, and firearm.
What Does 55 Grain vs. 62 Grain Mean?
The grain number refers to the weight of the projectile.
A 55-grain 5.56 bullet is lighter than a 62-grain 5.56 bullet.
Both weights are commonly available as factory FMJ ammunition. Federal’s current catalog, for example, lists a 55-grain FMJ-BT 5.56 load and a 62-grain FMJ-BT 5.56 load.
The difference is only seven grains, but bullet weight is not the only thing that changes between loads.
Bullet shape, construction, powder charge, and the manufacturer’s overall ammunition design can also affect the characteristics of the cartridge.
That’s why it’s better to compare the complete load rather than assuming every 55-grain or 62-grain cartridge performs identically.
55 Grain 5.56 Ammo
55 grain 5.56 ammo is one of the classic choices for range and training ammunition.
The weight is closely associated with M193-style 5.56 ammunition, and modern commercial manufacturers continue to offer 55-grain FMJ loads for recreational shooting and training.
Federal, for example, currently lists its American Eagle AE193 load as a 55-grain FMJ-BT 5.56 cartridge.
For buyers, 55-grain ammunition is attractive because it is widely available and commonly offered in bulk packages.
Why Buy 55 Grain 5.56?
- Widely available
- Common in FMJ range ammunition
- Frequently offered in bulk quantities
- Long-established 5.56 bullet weight
- Broad selection from major manufacturers
- Often competitively priced
For high-volume range shooting, availability and cost per round can be just as important as the small differences between bullet weights.
62 Grain 5.56 Ammo
62 grain 5.56 ammo is another major category, particularly among M855-style and other 62-grain factory loads.
The classic M855 cartridge uses a 62-grain projectile, which is why buyers often associate 62-grain 5.56 with “green tip” ammunition. Commercial 62-grain FMJ loads are also available without necessarily being military M855 ammunition.
Federal’s current catalog lists a 62-grain FMJ-BT 5.56 American Eagle load alongside its 55-grain version.
That distinction matters: 62 grains describes bullet weight; it does not automatically mean M855.
55 vs. 62 Grain 5.56: Basic Comparison
| Feature | 55 Grain | 62 Grain |
|---|---|---|
| Bullet weight | Lighter | Heavier |
| Common range use | Very common | Very common |
| FMJ availability | Excellent | Excellent |
| Typical velocity profile | Higher in comparable loads | Lower in comparable loads |
| Recoil characteristics | Load-dependent | Load-dependent |
| Common association | M193-style | M855-style |
| Bulk availability | Excellent | Excellent |
These are general comparisons. Actual specifications vary by manufacturer and individual cartridge.
For example, Federal’s current published data lists its 55-grain AE193 load at a higher advertised muzzle velocity than its 62-grain AE855 load.
What Changes When You Go From 55 to 62 Grain?
The most obvious change is bullet weight.
The heavier 62-grain projectile generally requires a different ammunition setup than a 55-grain projectile. In comparable loads, the heavier bullet is commonly associated with lower muzzle velocity.
Other characteristics can change as well, including the trajectory profile and recoil impulse.
However, those differences should not be exaggerated. The exact ammunition design matters, and a 55-grain load from one manufacturer isn’t necessarily directly comparable to a 62-grain load from another.
55 Grain vs. 62 Grain Velocity
One of the easiest differences to see in manufacturer specifications is velocity.
A lighter bullet can generally be propelled faster when other load characteristics are comparable.
Federal’s current rifle ballistics data provides a useful example: its 55-grain AE193 5.56 load is listed at 3,165 feet per second at the muzzle, while its 62-grain AE855 is listed at 3,020 feet per second.
Those numbers are specific to those Federal loads and test conditions. They should not be treated as universal values for every 55- or 62-grain 5.56 cartridge.
When comparing ammunition, use the manufacturer’s published specifications for the exact product.
Does 62 Grain 5.56 Have More Recoil?
Bullet weight can influence recoil, but it isn’t the only factor.
A heavier projectile can contribute to a different recoil impulse, while velocity, propellant charge, firearm weight, and other factors also matter.
As a result, simply knowing that one cartridge uses a 62-grain bullet doesn’t tell you exactly how it will feel compared with a particular 55-grain load.
For range buyers, the difference is generally more useful to understand as part of the overall ammunition design rather than as a reason to assume one weight will always feel better.
55 Grain vs. 62 Grain Accuracy
Bullet weight can affect how ammunition performs in a particular firearm, but there is no universal rule that 55-grain or 62-grain ammunition is automatically more accurate.
The projectile’s shape, construction, manufacturing consistency, and the firearm itself can all matter.
A load that performs well in one firearm may not produce identical results in another.
For that reason, buyers should avoid choosing a 5.56 load solely because of its grain weight when accuracy is the primary concern.
The exact factory load is what should be evaluated.
Does 62 Grain 5.56 Require a Different Twist Rate?
This is one area where the complete projectile design matters.
A bullet’s length, shape, and weight all contribute to its stabilization requirements. Two bullets with the same weight can have different dimensions and aerodynamic profiles.
The classic M855 62-grain projectile has specific stabilization considerations, which is one reason manufacturers and ammunition references discuss twist rate when describing it.
For a particular firearm, follow the firearm manufacturer’s specifications rather than assuming that every 62-grain 5.56 load has identical stabilization requirements.
55 Grain vs. 62 Grain for Range Use
For general 5.56 range ammo, both weights are widely represented.
If your primary considerations are cost and availability, 55-grain FMJ is often an easy category to shop.
If you prefer a 62-grain load, there are also numerous commercial options, including FMJ ammunition intended for training and recreational shooting.
Federal has marketed both 55- and 62-grain 5.56 ammunition specifically in bulk configurations, illustrating how established both categories are for range use.
The choice doesn’t need to be complicated.
Start with your range’s ammunition requirements, then compare the exact loads that fit those requirements.
55 Grain vs. 62 Grain for Bulk 5.56
For buyers purchasing bulk 5.56 ammo, cost per round becomes particularly important.
Both 55- and 62-grain FMJ ammunition can be found in larger packages.
When comparing bulk ammunition, look beyond the round count and advertised price.
Check:
- Cost per round
- Manufacturer
- Bullet type
- Bullet weight
- Case material
- Package quantity
- Range restrictions
- Published ammunition specifications
A slightly cheaper case isn’t necessarily the better value if the product doesn’t meet the requirements of the range or firearm.
Is 55 Grain or 62 Grain Better for Range Training?
Neither weight is universally better.
55-grain 5.56 is a particularly common choice for general range use because of its availability and long history as a standard 5.56 bullet weight.
62-grain 5.56 is also widely available and offers another common option for buyers who prefer that weight.
For most range-focused purchasing decisions, price, availability, ammunition quality, and compatibility are more useful factors than trying to declare one grain weight the winner.
55 Grain vs. 62 Grain: M193 and M855
The 55-grain and 62-grain comparison is often presented as M193 vs. M855.
There is a historical reason for that.
M193 is associated with a 55-grain FMJ projectile, while M855 uses a 62-grain projectile. American Rifleman identifies both as major military 5.56 loads used over the history of the M16 family.
But buyers should avoid treating the terms as interchangeable with bullet weight.
Not every 55-grain 5.56 cartridge is M193, and not every 62-grain 5.56 cartridge is M855.
Commercial ammunition manufacturers produce many different 55- and 62-grain loads.
Does 62 Grain Mean Green Tip?
No.
The classic M855 cartridge is commonly recognized by its green-tipped projectile, but 62 grain does not automatically mean green tip or M855.
Commercial manufacturers produce 62-grain FMJ ammunition using different projectile designs.
The same principle applies to 55-grain ammunition.
Always read the product description and manufacturer’s specifications rather than identifying ammunition solely by bullet weight or appearance.
What About .223 vs. 5.56?
The distinction between .223 Remington and 5.56 NATO is separate from the 55-grain vs. 62-grain question.
Both cartridges can be found with 55- and 62-grain projectiles, but cartridge designation and firearm chambering still matter.
A firearm manufacturer’s specifications should determine which ammunition is appropriate.
The fact that a projectile weighs 55 or 62 grains does not change the cartridge designation.
What Should Buyers Look for in 5.56 Range Ammo?
When shopping for range ammunition, start with the complete product.
Check the Cartridge
Confirm whether the ammunition is labeled .223 Remington or 5.56 NATO and follow the firearm manufacturer’s specifications.
Check the Bullet Weight
Decide whether you want a 55- or 62-grain load based on the characteristics and specifications of the particular product.
Check the Bullet Type
FMJ is common for range ammunition, but not every 55- or 62-grain cartridge uses the same projectile construction.
Check the Case
Brass-case ammunition is widely available, while other case materials are also sold. Your range may have restrictions.
Check the Price Per Round
For regular range use, the difference between buying individual boxes and bulk cases can be significant.
Check Range Rules
Some ranges restrict particular ammunition types. Verify those requirements before purchasing large quantities.
Common Mistakes When Comparing 55 and 62 Grain 5.56
Assuming heavier means better
A heavier bullet isn’t automatically better. It simply has a different weight and potentially different ballistic characteristics.
Assuming all 55-grain ammunition is M193
It isn’t. M193 is a specific military load designation.
Assuming all 62-grain ammunition is M855
It isn’t. Many commercial manufacturers offer 62-grain ammunition that is not M855.
Comparing grain weight without comparing the load
Bullet weight is only one specification. Projectile construction and manufacturer design also matter.
Buying bulk ammunition before checking range rules
Always check the range’s requirements first. Buying a large case of ammunition that isn’t permitted is an avoidable mistake.
Frequently Asked Questions
Is 55 grain or 62 grain 5.56 better for range use?
Neither is universally better. Both are widely available for range and training use. Compare the exact load, price, availability, firearm compatibility, and range requirements.
What is the difference between 55 grain and 62 grain 5.56?
The primary difference is projectile weight. A 62-grain bullet is seven grains heavier than a 55-grain bullet. That difference can affect velocity and other ballistic characteristics, depending on the complete ammunition load.
Is 55 grain 5.56 good for range ammo?
Yes. 55-grain FMJ is one of the most common categories of 5.56 range ammunition and is widely available in bulk packages.
Is 62 grain 5.56 good for range ammo?
Yes. 62-grain FMJ ammunition is also widely available for range and training use.
Is 55 grain the same as M193?
Not necessarily. M193 is a specific 55-grain 5.56 military cartridge. Commercial 55-grain ammunition can use different specifications and projectile designs.
Is 62 grain the same as M855?
No. M855 is a specific 62-grain 5.56 cartridge. Commercial 62-grain ammunition can have different projectile construction and specifications.
Does heavier 5.56 ammunition have more recoil?
Bullet weight can influence recoil, but velocity, propellant charge, firearm weight, and other factors also contribute. Grain weight alone doesn’t determine how a particular load will feel.
Does 62 grain 5.56 have lower velocity than 55 grain?
Often, when comparing otherwise similar loads, the heavier 62-grain bullet has a lower advertised velocity. Federal’s current 55- and 62-grain American Eagle loads illustrate this difference.
Can I buy 55 grain and 62 grain 5.56 in bulk?
Yes. Both weights are offered in bulk configurations by major ammunition manufacturers, although current availability and package sizes vary.
Final Thoughts
The difference between 55 grain vs. 62 grain 5.56 is real, but it doesn’t need to be complicated.
A 55-grain bullet is lighter and is widely represented in traditional and modern FMJ range ammunition. A 62-grain bullet is heavier and is also extensively available, including in commercial FMJ loads and ammunition derived from established military configurations.
For range use, neither weight is automatically the better choice.
The smarter approach is to compare the complete ammunition load: cartridge designation, bullet construction, manufacturer, bullet weight, published specifications, price, and range requirements.
If you’re buying large quantities of 5.56 for regular range use, those practical factors will usually matter far more than the seven-grain difference by itself.