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Subsonic 556 muzzle energy12/2/2023 ![]() Recoil impulse is also significantly less than a. The ammunition is also dramatically lighter allowing more rounds to be carried compared to a. So, the weapon system is smaller and lighter, more maneuverable and less fatiguing to carry. In this regard, the 6mm ARC neatly fits into a weapon platform that is dramatically smaller and lighter than a traditional AR-10 platform required by the. As a cartridge is part of a weapons complex, everything must be taken into consideration. 308 Winchester or at least maintains parity. However, in some areas the 6mm ARC does dominate the. 308 Winchester at first glance you wouldn’t think there would be any comparison at all, and in some respects there isn’t. 308 Winchester? As the 6mm ARC is a dramatically smaller cartridge than the. The US Army developed the 6mm SAW cartridge (center) which showed great potential, it is seen here flanked by a. So, the 6mm ARC outperforms any magazine length 5.56x45mm NATO load simply through a combination of sheer horsepower and more efficient projectiles. How do these stack up compared to a 5.56x45mm Mk 262 Mod 1 77-grain OTM? The 6mm ARC’s more efficient projectiles with their high BCs provides superior exterior ballistics with noticeably less wind drift, higher retained velocity and greater retained energy. 536 and an advertised velocity of 2,750 fps. Lastly there is their 108-grain ELD-Match load with a G1 BC of. 530 and an advertised velocity of 2,750 fps from a 24-inch barrel. 512 and an advertised velocity of 2,800 fps from a 24-inch barrel. The first is a 103-grain ELD-X Precision Hunter. Hornady is launching the new cartridge with three loads. Bolt design also comes into play as well, and Bill Alexander, the designer of the 6.5mm Grendel, spent a considerable amount of time designing a Colt pattern bolt with a long service life. These dimensions are the biggest hurdle to overcome when designing a cartridge that offers superlative performance in an AR-15 while also functioning reliably. This means their diameter and overall length are dictated by the confines of the dimensions of a STANAG magazine. One very important aspect of both its parent cartridge and the 6mm ARC is they were both specifically designed to function in an AR-15. Hornady is launching the 6mm ARC with three loads running in weight from 103 to 108 grains at about between 2,750 and 2,800 fps from a 24-inch barrel. Advertised velocity of the 6mm ARC 108-grain ELD-Match load is 2,750 fps from a 24-inch barrel. 308-inch 175-grain Sierra MatchKing or a. This is substantially higher than either a. For example, the Hornady 108-grain ELD-Match bullet has a G1 BC of. It was specifically designed to utilize very long for caliber projectiles with very high Ballistic Coefficients to enhance exterior ballistics. 243-inch projectiles running from 103 to 108 grains. The 6mm ARC on the other hand is designed around modern. 264-inch projectiles running from 95 to 144-grains, the cartridge is at its best with projectiles weighing from 107 to 123 grains. While the 6.5mm Grendel was designed around. These are readily available and of known quality. As they have the same casehead diameter the 6mm ARC utilizes the same AR-15 bolt as the 6.5mm Grendel. 059-inch rim of the 6.5mm Grendel which is significantly thicker than the. The neck though has been moved back to facilitate loading the very long for caliber 6mm projectiles. 441-inch diameter casehead with the 6.5mm Grendel as well as the. It is not simply a necked down Grendel though, rather the engineers at Hornady made some changes to the case design to optimize it for their needs. The new Hornady 6mm Advanced Rifle Cartridge, or ARC, is based off another very popular design, the 6.5mm Grendel. ![]() Hornady engineers used the 6.5mm Grendel as the starting point for developing the 6mm ARC to meet the needs of a DoD entity. Basically, most readers want to know if they should bother to pay attention to the new 6mm ARC, or will it simply fade away in a year, like so many do? Let’s start by taking a brief look at the cartridge itself, then move into what it was designed to accomplish and then into if it might be right for you. The question is, why was it developed and what does it actually bring to the table. Big news from Hornady Manufacturing who officially released their new 6mm ARC cartridge.
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