Understanding 5.56x45mm NATO ballistics requires tracking both its rapid deceleration over distance and its blistering initial speed at the barrel.
As the projectile travels downrange, its light mass causes it to shed speed quickly against air resistance, dropping a standard 62-grain bullet from 3,100 fps to roughly 875 fps at 1,000 yards.
At the muzzle, velocities typically range from roughly 2,600 fps for heavy 77-grain loads in short barrels up to an intense 3,250 fps for 55-grain ammunition in full-length rifles. The charts below map out exactly how fast 5.56 NATO ammunition travels across extreme distances and varying AR-15 barrel lengths.
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5.56 NATO Velocity Chart at 100 to 1,000 Yards
| Distance (yards) | Distance (meters) | Ammunition / Bullet Weight | Barrel Length (inches) | Estimated Velocity (fps) | Velocity Loss from Muzzle (fps) |
| Muzzle (0) | 0.0 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 3,100 fps (Published) | 0 fps |
| 100 yards | 91.4 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 2,775 fps (G1 Calculation) | 325 fps |
| 200 yards | 182.9 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 2,470 fps (G1 Calculation) | 630 fps |
| 300 yards | 274.3 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 2,180 fps (G1 Calculation) | 920 fps |
| 400 yards | 365.8 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 1,910 fps (G1 Calculation) | 1,190 fps |
| 500 yards | 457.2 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 1,655 fps (G1 Calculation) | 1,445 fps |
| 600 yards | 548.6 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 1,425 fps (G1 Calculation) | 1,675 fps |
| 700 yards | 640.1 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 1,225 fps (G1 Calculation) | 1,875 fps |
| 800 yards | 731.5 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 1,065 fps (Transonic) | 2,035 fps |
| 900 yards | 823.0 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 955 fps (Extrapolation) | 2,145 fps |
| 1,000 yards | 914.4 m | M855 62-gr FMJ (BC: ~0.304) | 20.0 | 875 fps (Extrapolation) | 2,225 fps |
5.56 NATO Muzzle Velocity Chart
| Ammunition Type | Bullet Weight (grains) | Barrel Length (inches) | Muzzle Velocity (fps) | Muzzle Energy (ft-lbs) |
| 55-grain FMJ (M193) Military Specification [Standard Spec] | 55 | 20.0 (Standard Rifle) | 3,250 (Advertised) | 1,290 |
| 55-grain FMJ (M193) Military Specification [Independent Estimate] | 55 | 16.0 (Carbine) | 3,100 (Estimated) | 1,174 |
| 55-grain FMJ (M193) Military Specification [Independent Estimate] | 55 | 10.5 (SBR / Pistol) | 2,750 (Estimated) | 923 |
| 62-grain FMJ (M855) Military Specification [Standard Spec] | 62 | 20.0 (Standard Rifle) | 3,100 (Advertised) | 1,323 |
| 62-grain FMJ (M855) Military Specification [Independent Estimate] | 62 | 16.0 (Carbine) | 2,950 (Estimated) | 1,198 |
| 62-grain FMJ (M855) Military Specification [Independent Estimate] | 62 | 10.5 (SBR / Pistol) | 2,600 (Estimated) | 930 |
| 77-grain OTM (Mk262 Mod 1) Military Specification [Standard Spec] | 77 | 18.0 (SPR Profile) | 2,750 (Advertised) | 1,293 |
| 77-grain OTM (Mk262 Mod 1) Military Specification [Independent Estimate] | 77 | 16.0 (Carbine) | 2,650 (Estimated) | 1,200 |
| 77-grain OTM (Mk262 Mod 1) Military Specification [Independent Estimate] | 77 | 10.5 (SBR / Pistol) | 2,350 (Estimated) | 944 |
Factors Affecting Velocity
- Barrel Length: The 5.56 NATO cartridge is highly dependent on barrel length to achieve its signature velocity. Originally designed for a 20-inch barrel, cutting the barrel down to a 16-inch carbine results in a loss of about 150 fps. Dropping to a 10.5-inch Short Barreled Rifle (SBR) sacrifices roughly 500 fps, drastically reducing the round’s effective fragmentation range.
- Chamber Pressure: 5.56 NATO ammunition is loaded to higher maximum chamber pressures (up to 62,000 psi) compared to standard commercial .223 Remington (up to 55,000 psi). This extra pressure is what allows military loads like M193 and M855 to achieve higher muzzle velocities than their commercial .223 counterparts.
- Bullet Weight & Terminal Ballistics: Lightweight 55-grain (M193) bullets travel the fastest and rely on hitting targets at over 2,500 fps to violently tumble and fragment. Heavier 77-grain bullets (Mk262) start slower but carry their energy better over long distances, making them the preferred choice for designated marksman rifles (DMRs) and special operations.
- Ballistic Coefficient (BC): Standard military 5.56 bullets are light and relatively blunt, giving them a low Ballistic Coefficient. This means they are highly vulnerable to aerodynamic drag and wind deflection. A 5.56 bullet bleeds off speed significantly faster than larger, heavier rifle rounds like the .308 Winchester.
Frequently Asked Questions (FAQs)
At what distance does a 5.56 NATO go subsonic?
Fired from a 20-inch barrel, a standard 62-grain M855 bullet typically drops below the speed of sound (around 1,125 fps) between 750 and 800 yards. If fired from a shorter 16-inch barrel, it crosses the transonic boundary earlier, usually around 650 to 700 yards.
Does a 10.5-inch barrel ruin the 5.56 cartridge?
It doesn’t ruin it, but it changes its capability. Standard 55-grain 5.56 ammunition relies on high velocity (typically above 2,500 fps) to reliably fragment in soft tissue. Out of a 10.5-inch barrel, the muzzle velocity is only around 2,750 fps, meaning the bullet drops below the fragmentation threshold within just 50 to 100 yards, limiting its effectiveness at longer ranges.
What is the difference in velocity between M193 and M855?
M193 is a 55-grain bullet, while M855 is a 62-grain bullet with a mild steel penetrator core. Because the M193 is lighter, it leaves the muzzle about 150 fps faster than the M855. However, the heavier M855 has a slightly better ballistic coefficient, allowing it to retain velocity better at extended distances.
Why is 5.56 NATO faster than .223 Remington?
While the cartridges share identical external dimensions, 5.56 NATO specifications allow for a longer leade (the unrifled portion of the chamber in front of the bullet) and higher chamber pressures. This combination allows manufacturers to use slightly hotter powder charges, driving 5.56 NATO rounds roughly 100 to 150 fps faster than standard commercial .223 Remington.