Brownells 75th Anniversary - A Shooting Heritage

6mm ARC

Throw Out the Old Rules! Until now, true long-range shooting from the AR platform has largely been reserved to larger "AR-308" rifles. Those old rules go out the window with the 6mm ARC from Hornady - a cartridge that delivers an 800 to 1,000 yard effective range from a standard AR-15 platform.

What is 6mm ARC?

The 6mm ARC cartridge is based on the 6.5 Grendel case necked down for 6mm bullets. Good News! If you already have a rifle chambered in 6.5 Grendel, the ONLY thing you need to change is the barrel. Everything else - bolt, magazines, gas system - is compatible with 6mm ARC.

  • Fits standard AR-15 rifles & Short/Mini action bolt rifles
  • 30-degree case shoulder for reliable feeding
  • Short, squat case profile similar to the 6mm PPC, one of the most accurate benchrest cartridges ever
  • SAAMI spec cartridge, so NOT a fly-by-night Wildcat!
Image of 5.56/224, 6mm ARC, 6.5 Grendal, and .308 cartridges.

From left to right:
5.56/.223, 6mm ARC, 6.5 Grendal, and .308.

Shop 6mm ARC Ammo
6mm ARC balistics graph showing it's performance at 1500 fps out at 1000 yards.

Do I Really Need 6mm ARC?

That depends on how much its characteristics appeal to you! The 6mm "Advanced Rifle Cartridge" produces velocities higher than many .308 Win loads and similar to the popular long-range 6mm Creedmoor round - in a much smaller package.

  • Propels a 108-grain bullet at 2,750 fps and STAYS supersonic out past 1,000 yards!
  • Flatter trajectory & less wind deflection than 6.5 Grendel
  • MUCH more on-target energy than any .223/5.56 AR cartridge
  • Pleasantly low recoil
6mm ARC barrel, bolt carrier, and magazine.

I'm Hooked. What Do I Need To Shoot 6mm ARC?

Faxon and Ballistic Advantage are already producing barrels, with more manufacturers sure to follow. All the other required components are already on the market for 6.5 Grendel rifles. If you're converting a standard 5.56 AR-15 to 6mm ARC, you'll need to swap the following:

  • Magazines
  • A Type II 6.5 Grendel bolt carrier group
  • 6mm ARC barrel
  • Shortcut: complete upper receiver by Aero Precision
  • Hornady 6mm ARC ammo, of course!