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AMMO AND PRIMERS IN STOCK , BUY BULK AMMO NOW IN STOCK , 6MM ARC AMMO IN STOCK NOW , BUY PRIMERS AT AFOORDABLE PRICES ONLINE. It’s a short, fat, PPC-looking round that’s very deceiving for the power it actually contains. In a nutshell, Hornady took a 6.5 Grendel case, necked it down to .243 (6mm) diameter and moved the 30-degree shoulder back .030 inch so the company’s long, ultra-high ballistic coefficient (BC) ELD bullets could be seated as shallow as possible and yet still remain under the AR-15’s max overall length of 2.260 inches. Hornady blended powders and experimented with charges and bullet weights until engineers smiled. From an 18-inch test barrel, the 6mm ARC launched a 108-grain ELD Match bullet at 2750 fps for 1,880 ft.-lbs. of energy at the muzzle. But doesn’t the 6.5 Grendel, with its heavier bullet but lower velocity, or even the .224 Valkyrie, with its smaller, faster bullet, accomplish the same thing from an AR-15? And what about the venerable .243 Win.? Is Hornady splitting hairs? Is this a marketing ploy?

Well, certainly these cartridges are close, just as so many are nowadays. For the guy shooting 200 to 300 yards, the ARC lends a bigger .244-caliber bullet selection over the Grendel. For the guy shooting beyond 300, there’s a distinct advantage in wind deflection. As for the .224 Valkyrie, in some states you can’t legally hunt big game with a .22-caliber; 6mm (.244) is the minimum. As for .243 Win., you are not going to hear me arguing in favor of any Johnny-come-lately over the .243 or 6mm Rem.—except when it comes to performance from a short-barreled AR-15.

All told, the 6mm ARC sends a 108-grain, .536 BC bullet that’s still going 1440 fps at 1,000 yards for 500 ft.-lbs. energy with 320 inches of drop and a mere 75 inches of drift in a 10-mph, 90-degree wind. Compare that to a 73-grain ELD bullet from a .556 going 2700 fps resulting in just 157 ft.-lbs. energy at 1,000 yards with 393 inches of drop and 111 inches of drift. As for recoil, the ARC produces 9.9 ft.-lbs. from a 6.8-pound rifle. That’s slightly less than a .243 Win.