6.5 Grendel case The 6mm ARC was developed by Hornady for the Dept. of Defense, who wanted a cartridge that had better long-range capabilities than the 5.56, yet still fit the AR-15 platform. The ARC certainly does that. Based on the 6.5 Grendel case, the ARC has a .

1,000 yards "The 6mm ARC is unique among rifle cartridges in that it fits in an AR-15-pattern action, functions reliably out of standard-capacity 24- or 17-round magazines, and remains supersonic beyond 1,000 yards in a standard atmosphere."

6mm ARC is designed for the AR-15 platform and offers a long effective range of up to 1000 meters. With the bigger bullet, the 6mm ARC has more stopping power and is much more effective in putting down big games like deer and elk.

Although . 30-caliber cartridges are perennial favorites and 6.5 mm rounds now get a lot of attention, cartridges that fire 6 mm bullets are ideal for many American hunters. They offer low recoil and flat trajectories for varmint and predator hunting, and they have enough punch for deer-sized game.

16 to 18 inches The Most Versatile Lengths for 6mm ARC Barrels Based on our experience and feedback from other shooters, 16 to 18 inches is the ideal 6mm ARC barrel length if you want a gun that does it all. In fact, according to Hornady, 18 inches is the optimal barrel length for military applications.

Hornady recommends a 1:7.5” twist rate for your rifling to stabilize these bullets. But the 6mm ARC isn't limited to those heavy-for-class bullets; it can be loaded with bullets as light as 58 grains.

Compare with similar items

This is a list of firearm cartridges which have bullets of a caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in). Measurements are in millimeters then inches, i.e. mm (in).

Common 6mm ARC Barrel Length Options

• 16-18 inches: A good choice for mid-range combat or hunting, this barrel length provides enough velocity to get the job done.
• 20 inches: This length is ideal for prey or target shooting, with an impressive velocity that can help you hit your mark.

6mm ARC Rifles

• Seekins Precision 0011300095 DMR 6mm ARC 22 in 30+1 Black10X-Ray Stock.
• Savage 57769 Axis II 6mm ARC 22 in Matte Black Matte Black Synthetic Stock Right Hand.
• Savage 57770 110 Tactical 6mm ARC 18 in Matte Gray Fixed AccuStock w|AccuFit Stock Matte Black Right Hand.

16 to 18 inches The Most Versatile Lengths for 6mm ARC Barrels Based on our experience and feedback from other shooters, 16 to 18 inches is the ideal 6mm ARC barrel length if you want a gun that does it all. In fact, according to Hornady, 18 inches is the optimal barrel length for military applications.

Did Hornady make 6mm ARC for the U.S. Military? Yes, they did. It was designed by Hornady in response to a request from the Department of Defense. They wanted a cartridge that was combat-capable but usable in a smaller platform than the 308 Win, which is made for AR-10 platform rifles.