6mm ARC vs. 5.56 NATO: Does the 6mm ARC Make the 5.56 Out of date?

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The 6mm ARC is a flat-shooting (and newer) AR-15 cartridge with little recoil. The 5.56 NATO is the standard AR-15 cartridge, albeit not without significant flaws. In this 6mm ARC vs. 5.56 NATO comparison, we’ll learn if the 5.56 has finally been outdone or if you should keep your AR-15 chambered for it.

Overview of 6mm ARC vs. 5.56 Ammo

The 5.56×45 is beloved by many firearm enthusiasts (myself included), yet despised by others. It’s utilized by militaries worldwide because it is accurate, low-recoiling, and relatively inexpensive to fire. We civilians regularly use it for hunting (including deer in some states, but mostly varmint), home defense, target shooting, and competitive shooting.

The relatively new 6mm Advanced Rifle Cartridge (ARC) is a low-recoil, flat-shooting round that’s ideal for long-range target practice and hunting. It promises to do what the 5.56 can’t (deliver more stopping power), but it also has some downsides of its own (more on that later).

6mm ARC vs. 5.56 Pros and Cons

Neither of these rifle cartridges is perfect, as each has significant advantages over the other.

6mm ARC vs. 5.56 Ammo Specs

6mm ARC vs. 5.56 Recoil and Shooting Experience

The 5.56 has minimal recoil: ~5 ft-lbs of free recoil energy, give or take, depending on which rifle and ammo you’re firing. It’s often surprising to new shooters how little an AR-15 chambered in 5.56 kicks, which is why I typically use it to introduce new shooters to the sport. As an experienced shooter, I enjoy taking my 5.56 rifles to the range because they’re easy on my wallet and my shoulder compared to most other rifle cartridges.

The 6mm ARC has more recoil: ~9 ft-lbs of free recoil energy. While that’s nearly double the 5.56’s recoil energy, it’s still very manageable (15 ft-lbs or less is manageable for most shooters). The main problem with the 6mm ARC is its shorter barrel life: you’ll only get ~5,000 rounds per barrel. Whereas you’ll get 10,000 to 30,000 rounds out of a 5.56 barrel.

Accuracy and Effective Range

In the hands of the average shooter, the 5.56 is very accurate out to 250 yards. When a well-trained individual takes hold of a 5.56 rifle, they can accurately cover up to 600 yards. In military applications, the 5.56 is effective against area targets out to the 600-yard mark. But for deer hunting purposes, its effective range maxes out at ~200 yards.

In the hands of a capable shooter, the 6mm ARC is accurate enough to make 1,000+ yard shots. It can ethically drop varmints at 1,000 yards, too. But for deer hunting, it’s limited to ~500 yards. The 6mm ARC definitely has the advantage in long-range situations.

Penetration and Terminal Ballistics

The 5.56 easily penetrates wood, drywall, and soft tissue, but it doesn’t retain enough energy to ethically harvest medium game beyond 200 yards. Many 5.56 bullets yaw (i.e. tumble) after impact, creating a larger wound channel than the diameter of the bullet. Others (especially FMJs) will fragment apart after impact instead.

The 6mm ARC also easily penetrates wood, drywall, and soft tissue. Unlike the 5.56, it retains enough energy to ethically harvest medium game within ~500 yards. While some 6mm ARC bullets yaw after impact, most hunting ammo is loaded with polymer-tipped hollow point bullets that expand after impact to inflict a larger wound channel.

6mm ARC vs. 5.56 for Hunting

If you’re willing to spend the extra money on ammo, the 6mm ARC is generally better for most hunting applications. However, there are some instances when the 5.56 is the better choice for hunting.

6mm ARC vs. 5.56 for Small Game

The 5.56 is slightly better for small game, but often too powerful for rabbits and squirrels.

6mm ARC vs. 5.56 for Coyotes

Both cartridges can ethically harvest coyotes, but the 6mm ARC will give you more range.

6mm ARC vs. 5.56 for Hogs

The 6mm ARC is better for hog hunting because it maintains more energy downrange. That’s needed to punch through wild hogs’ armor-like hide and bone.

6mm ARC vs. 5.56 for Deer

The 6mm ARC is better for deer hunting because it can ethically harvest deer out to 500 yards, whereas you’re limited to ~200 yards with the 5.56 – and in some states the 5.56 is illegal for deer hunting. Both rounds are illegal for hunting in states that require the use of straight-walled cartridges, though.

Availability, Compatibility, and Shooting Platforms

The 5.56x45mm is considerably more abundant and less costly than the 6mm ARC. Both rifle cartridges are typically chambered in the AR-15 platform, but 5.56 rifles are much easier to find. It’s unlikely that the 6mm ARC will ever be as popular or inexpensive as the 5.56.

Are They Good for Home Defense?

I’m not a fan of using rifles for home defense. Pistol caliber carbines are a different story, but rifles are more likely to over-penetrate and endanger innocent bystanders.

Read the full comparison here: https://ammo.com/comparison/6mm-arc-vs-556