As the 6mm ARC travels downrange, a 108-grain bullet retains its speed exceptionally well, dropping to roughly 1,350 fps at 1,000 yards. At the muzzle, velocities measure roughly 2,800 fps for 103-grain hunting loads and 2,750 fps for 108-grain match projectiles. The charts below detail these velocity measurements across extreme distances and varying barrel lengths.
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6mm ARC 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 | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 2,750 fps (Published) | 0 fps |
| 100 yards | 91.4 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 2,580 fps (G1 Calculation) | 170 fps |
| 200 yards | 182.9 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 2,420 fps (G1 Calculation) | 330 fps |
| 300 yards | 274.3 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 2,265 fps (G1 Calculation) | 485 fps |
| 400 yards | 365.8 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 2,115 fps (G1 Calculation) | 635 fps |
| 500 yards | 457.2 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,975 fps (G1 Calculation) | 775 fps |
| 600 yards | 548.6 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,835 fps (G1 Calculation) | 915 fps |
| 700 yards | 640.1 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,705 fps (G1 Calculation) | 1,045 fps |
| 800 yards | 731.5 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,580 fps (G1 Calculation) | 1,170 fps |
| 900 yards | 823.0 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,460 fps (G1 Calculation) | 1,290 fps |
| 1,000 yards | 914.4 m | 108-gr Hornady ELD Match (BC: ~0.536) | 24.0 | 1,350 fps (G1 Calculation) | 1,400 fps |
6mm ARC Muzzle Velocity Chart
| Ammunition Type | Bullet Weight (grains) | Barrel Length (inches) | Muzzle Velocity (fps) | Muzzle Energy (ft-lbs) |
| 103-grain Polymer Tip Hornady Precision Hunter ELD-X [Manufacturer Spec] | 103 | 24.0 (Standard Rifle) | 2,800 (Advertised) | 1,793 |
| 103-grain Polymer Tip Hornady Precision Hunter ELD-X [Independent Estimate] | 103 | 18.0 (SPR / Carbine) | 2,680 (Estimated) | 1,643 |
| 103-grain Polymer Tip Hornady Precision Hunter ELD-X [Independent Estimate] | 103 | 16.0 (Carbine) | 2,630 (Estimated) | 1,582 |
| 105-grain BTHP Hornady BLACK [Manufacturer Spec] | 105 | 24.0 (Standard Rifle) | 2,750 (Advertised) | 1,763 |
| 105-grain BTHP Hornady BLACK [Independent Estimate] | 105 | 18.0 (SPR / Carbine) | 2,630 (Estimated) | 1,613 |
| 105-grain BTHP Hornady BLACK [Independent Estimate] | 105 | 16.0 (Carbine) | 2,580 (Estimated) | 1,552 |
| 108-grain Match Hornady Match ELD-M [Manufacturer Spec] | 108 | 24.0 (Standard Rifle) | 2,750 (Advertised) | 1,813 |
| 108-grain Match Hornady Match ELD-M [Independent Estimate] | 108 | 18.0 (SPR / Carbine) | 2,630 (Estimated) | 1,659 |
| 108-grain Match Hornady Match ELD-M [Independent Estimate] | 108 | 16.0 (Carbine) | 2,580 (Estimated) | 1,596 |
Factors Affecting Velocity
- AR-15 Platform Constraints: The 6mm Advanced Rifle Cartridge (ARC) was designed to maximize the ballistic performance of the AR-15 platform. Because it is limited by the standard AR-15 magazine length, it utilizes a short and fat case. This provides enough powder capacity to push heavy 6mm bullets efficiently without relying on the higher chamber pressures required by larger bolt-action cartridges.
- Ballistic Coefficient (BC): The primary advantage of the 6mm ARC is its ability to fire heavy, high-BC .243-caliber bullets. While the muzzle velocities might seem moderate compared to smaller varmint cartridges, the sleek profile of a 108-grain bullet allows it to slice through the air with minimal drag. This results in excellent velocity retention and much less wind drift at extended ranges.
- Barrel Length: Most published data for the 6mm ARC uses a 24-inch test barrel to show maximum potential. However, the cartridge was optimized for 18-inch and 16-inch gas-operated rifles. Dropping from a 24-inch barrel to an 18-inch barrel typically costs about 120 fps, but the cartridge still delivers supersonic performance well past 1,000 yards.
- Gas System Efficiency: Because the 6mm ARC pushes relatively heavy bullets from a compact case, it benefits from rifle-length gas systems in 18-inch barrels. This ensures reliable cycling and consistent muzzle velocities by smoothing out the pressure curve before the bullet exits the muzzle.
Frequently Asked Questions (FAQs)
How does the 6mm ARC compare to the 5.56 NATO?
While both fit in the AR-15 platform, the 6mm ARC uses a much heavier, more aerodynamic bullet. The 5.56 NATO shoots a lighter bullet at a higher initial speed, but it loses velocity quickly. The 6mm ARC starts slightly slower but overtakes the 5.56 NATO at long distances, retaining significantly more kinetic energy and flying much straighter in the wind.
At what distance does a 6mm ARC go subsonic?
Fired from a 24-inch barrel, a 108-grain ELD Match bullet at 2,750 fps will remain supersonic (above ~1,125 fps) out to roughly 1,150 to 1,200 yards. Even from an 18-inch barrel at 2,630 fps, it easily remains supersonic past the 1,000-yard mark.
Is a 16-inch barrel too short for the 6mm ARC?
No. While you sacrifice about 150 to 170 fps compared to a 24-inch bolt-action barrel, a 16-inch 6mm ARC still outperforms an 18-inch 5.56 NATO at distance. It remains an excellent, highly maneuverable choice for hunting medium game or shooting steel targets out to 800 yards.
Why did Hornady develop the 6mm ARC?
Hornady developed the 6mm ARC at the request of a specialized group within the US Department of Defense. They needed a cartridge that could fit into standard M4 or AR-15 rifles but deliver better long-range barrier penetration and terminal ballistics than the 5.56 NATO without the heavy weight of an AR-10 platform chambered in .308 Winchester.