6.5 Grendel vs 6mm ARC
Typical factory loads side by side: speed, energy, BC, twist, range and what each one is built for.
The short answer
With typical loads, the 6mm ARC is about 170 ft/s faster at the muzzle (2,580 vs 2,750 ft/s).
The 6.5 Grendel carries about 5% more energy at the muzzle (1,818 vs 1,729 ft-lbs), which usually also means more recoil.
Side by side
| 6.5 Grendel | 6mm ARC | |
|---|---|---|
| Made for | Heavy 6.5 bullets from an AR-15: deer, hogs and long-range steel. | Hornady's Advanced Rifle Cartridge for the AR-15. Long-range-capable 6mm for deer, hogs and coyotes from a standard-size AR. |
| Typical load | 123 grSST · 24" barrel | 103 grELD-X |
| Muzzle speed | 2,580 ft/s | 2,750 ft/s |
| Muzzle energy | 1,818 ft-lbs | 1,729 ft-lbs |
| Typical BC (G1) | ≈ 0.51typical, varies by brand | 0.512maker's published G1 |
| Twist rate | 1:8 | 1:7.5 |
| Practical range | 300 yd deer | 300 yd |
| Point-blank range | — | 275 yd6" vital zone |
| Recommended platform | — | AR-15 or any light rifleVery light recoil |
Which one fits you?
6.5 Grendel: Heavy 6.5 bullets from an AR-15: deer, hogs and long-range steel.
6mm ARC: Hornady's Advanced Rifle Cartridge for the AR-15. Long-range-capable 6mm for deer, hogs and coyotes from a standard-size AR.
For most hunters, the right pick is the one you can shoot accurately and comfortably, in a rifle that fits how you hunt. Good shot placement and a bullet built for your game matter more than small differences on paper.
More
Speed, energy and BC are typical figures for the listed load; real numbers vary by brand, lot and barrel length. Always check the ammo maker's data for your exact load.