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500 round Case Black Hills Ammunition New D556N3 - 5.56 NATO Optimized 70 Grain Hornady GMX in 50 round boxes - FREE SHIPPING!

500 round Case Black Hills Ammunition New D556N3 - 5.56 NATO Optimized 70 Grain Hornady GMX in 50 round boxes - FREE SHIPPING!
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500 round Case Black Hills Factory New D556N3: 5.56mm Optimized 70 Grain Hornady GMX in 50 round boxes.

A brand new offering from Black Hills! A 5.56 Optimized/"Brown-Tip" with 70 Grain Hornady GMX Bullet.


Black Hills Ammunition has added a special purpose load to its growing 5.56mm lineup. This load, utilizing the 70 grain Hornady GMX® projectile is designed as a “barrier blind” round, meaning performance is only minimally affected by barriers. It’s not armor-piercing, but significantly out-performs conventional bullets in law enforcement situations where officers may be required to engage deadly threats in vehicles or behind light cover. It’s also optimum for hunting requiring great expansion combined with deep penetration and nearly 100% weight retention. This loading is designed for rifles with a rifling twist of 1/7” or 1/8”. Penetration in ballistic gelatin consistently runs 17-22”, with a wound diameter in the 5”range. Recovered bullet diameter averages nearly .50 caliber.

Black Hills
produces factory new rifle ammunition equal to some of the best handloads. It is quickly becoming one of most popular manufacturers of ammunition. Used primarily by all branches of the United State military, this ammunition is also used by competitive shooters and hunters.

The 70 grain GMX is a monolithic hollow-point, but unlike similar monolithic bullets such as the all-copper Barnes TSX, the Hornady GMX is made from gilding metal (95% copper and 5% zinc). Hence the “GM” portion of GMX.
The 70 grain GMX has a nominal length of approximately 1.048”, making it slightly longer than the 70 grain Barnes TSX. Molon posting on m4carbine.net

"Black Hills is now going to create and market a 5.56 pressure round, sealed at case neck, and primer, using the Hornady 70gr GMX projectile. It's probably as close as one can get to the fabled "Browntip" ammo, although I believe the Browntip uses a TSX instead of a GMX bullet. Arguably, the GMX is an even better projectile for its superior performance on windshields and its resistance to fouling barrels quite as much. As another tidbit, all 5.56 rounds that Black Hills loads with TSX or GMX projectiles, will now be sealed at the case neck (previously they were just sealed at the primers)." WeaponEvolution.com - "5.56 Optimized" alternative for Civilians

"Black Hills new 70-grain 5.56 is just the medicine for those searching for a high-performing monometal round. The load features a Hornady GMX monolithic copper alloy bullet. The longer projectile offers shooters an outstanding .350 ballistic coefficient. This combined with its weight and 95-percent retention of mass after impact, the round has excellent terminal ballistics and can really reach out and touch a critter. It also gives law enforcement a solid choice for a barrier penetration. Note, the load is designed to function with 1:7- and 1:8-inch twist rates." Gun Digest

Please Note: While the 5.56x45mm NATO will fit in a .223 Remington chamber, the 5.56 is a military round that runs at higher pressures than its .223 counterpart and is not recommended to be fired in a .223 Remington chamber.

Technical Information
  • Caliber: 5.56x45mm NATO
  • Bullet Weight: 70 Grain
  • Bullet Style: Hornady GMX
  • Case Type: Brass
Ballistics Information:
  • Muzzle Velocity: 2800 fps
  • Muzzle Energy: 1219 ft lbs
We are a Black Hills Ammunition authorized stocking dealer.
Hornady® GMX® 2014 TV Commercial

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