70 gr. GMX® TAP® BARRIER™ - Item No. 81265
TAP® Barrier™ turns cover into concealment. The 5.56 NATO 70 gr GMX®
Barrier™ round is a fantastic option for tactical situations that
require deep penetration and terminal performance after contact with any
FBI established urban barriers. The GMX® bullet is constructed entirely
from a tough copper alloy that will deliver high weight retention and
deep penetration. This bullet is well suited for guns with faster twist
rates and is extremely reliable for patrol carbine use or any other
situation that may involve vehicles or barricades.
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.
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
"...the Hornady 70gr GMX projectile...is 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. "
WeaponEvolution.com - "5.56 Optimized" alternative for Civilians
"(The) 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
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!
- Ballistic Coefficient: .350
- Sectional Density: .199
- Bullet Length: 1.050"
- Recommended Rifling Twist Rate: 1:7"
- Characteristics: Hollow point, Copper alloy
Information (20" NATO test barrel):
Weight: 70 Grain
Style: Hornady GMX
Velocity: 2882 fps
- Muzzle Energy: 1291 ft lbs