Hornady Superformance GMX Ammunition 5.56x45mm NATO 55 Grain GMX Boat Tail Lead-Free Box of 20
You must be 21 years or older to order ammunition. Ammo must ship UPS ground. Due to Department of Transportation regulations, we cannot accept returns on ammo. Please check local laws before ordering.
- Videos (2)
SUPERFORMANCE ammunition is loaded with proprietary propellants that increase the velocity ratings up to 200 feet per second compared to other popular brands. Because there is no increase in pressure, regardless of the caliber, there is no increase in felt recoil but there IS an increase in efficiency and high speed performance. From sub-zero arctic temperatures to almost unbearable desert heat, SUPERFORMANCE ammunition can withstand any hunting habitat.
Hard-hitting and deep-penetrating, the GMX bullet combines monolithic construction with pioneering ballistic design to meet the need for a premium, non-traditional bullet. The mono-metal design of the GMX bullet is crafted from a copper alloy. Harder than solid copper, the copper/zinc alloy has been proven to shoot cleaner, foul less, and deliver consistent, even pressure curves. The tough alloy material routinely retains 95% or more of its original weight and expands up to 1.5 times its original diameter. Featuring a long, sleek profile with cannelures, the design reduces the bullet’s overall bearing surface and drag, while achieving some of the highest ballistic coefficients from monolithic, non-traditional bullets. Initiating expansion upon impact, the hard polymer tip drives into the hollow cavity at the front of the bullet, creating a mushroom-style projectile as it travels through the animal. Fully California compatible and appropriate for use in other areas requiring the use of non-traditional bullets, GMX is ideal for any sized game, from antelope to moose. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.
Please Note: While the 5.56x45mm 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.
- Caliber: 5.56x45mm NATO
- Bullet Weight: 55 Grains
- Bullet Style: GMX
- Case Type: Brass
- Muzzle Velocity: 3130 fps
- Muzzle Energy: 1196 ft. lbs.
The total weight of the product, including the product’s packaging as it sits on our shelf. Since some products ship directly from the Manufacturer, their weight may be unavailable. Because of variations in the manufacturing process, similar products may have differing weights. Unless the product is designated as “Ships Alone”, Shipping Weight does not include the shipping box or packing materials associated with your order.
Product ships from MidwayUSA, separate from any other products on your order due to its size. Products that are Shipped Alone incur separate "Per Order" and "Per Pound" shipping charges.
Product is regulated by the US Department of Transportation (DOT) and cannot be shipped via USPS or air shipping methods. DOT-Regulated products must ship UPS Ground.
Product is restricted by shipping carriers and cannot be shipped to certain locations or via certain shipping methods.
- Cannot ship via air
- Cannot ship via USPS
- Cannot ship to PO Box
Additional shipping charge for HazMat products. Carriers charge extra to ship packages with products they consider hazardous, such as reloading powder and primers.
Thank you! Your valuable feedback helps improve our product information and offering.
MidwayUSA Buttstock Rifle Ammunition Carrier Black
$5.99List Price: $9.99 Save $4.00 (40%)
Maglula Magazine Loader and Unloader AR-15 223 Remington...
Caldwell Orange Peel Targets 8" Self-Adhesive Bullseye
$3.99 - $49.99List Price: $5.49 - $52.99 Save up to $4.00 (22%)
Howard Leight Leight Plugs Ear Plugs (NRR 30 dB)
$3.99 - $24.99
MTM Survivor Ammunition Can Plastic Black
Grace USA Brass Hammer
$14.99 - $19.99
Advanced Technology Strikeforce 6-Position Collapsible Side...
GoldenRod Dehumidifier Rod with Detachable Plug 110v Gold
Sale — Select ItemsView More Options$25.99 - $39.99Save up to $18.00 (36%)
Hornady Training Ammunition 223 Remington 55 Grain Soft Point
Hornady SUPERFORMANCE Ammunition 308 Winchester 178 Grain Boat...
Bianchi 57 Remedy Outside the Waistband Holster Springfield XD...
$44.80List Price: $56.00 Save up to $11.20 (20%)
Ruger Magazine Ruger Mini-14 223 Remington Steel Blue
$24.99 - $42.99
Ruger Stock Reinforcement Screw Ruger Mini-14, Mini-30
Hornady Custom Ammunition 357 Magnum 158 Grain XTP Jacketed...
Fiocchi Extrema Ammunition 9mm Luger 124 Grain Hornady XTP...
Hornady Critical Defense Ammunition 12 Gauge 2-3/4" 00...
Burris 1" Xtreme Tactical Picatinny-Style Rings Matte
$59.99 & SHIPS FREE
Winchester Ammunition 5.56x45 NATO 62 Grain M855 SS109...
$11.99 - $549.99
Federal American Eagle Ammunition 5.56x45mm NATO 55 Grain...
$8.99 - $219.99
Black Hills Ammunition 5.56x45mm NATO 77 Grain Sierra...
$53.06 - $518.13
Hornady Superformance Match Ammunition 5.56x45mm NATO 75 Grain...
Barnes VOR-TX Ammunition 5.56x45mm NATO 70 Grain Triple-Shock...
Barnes VOR-TX Ammunition 5.56x45mm NATO 62 Grain Triple-Shock...
Hornady Superformance GMX Ammunition 223 Remington 55 Grain...
Black Hills Remanufactured Ammunition 223 Remington 55 Grain...
MidwayUSA Folding Rifle Ammunition Case MOLLE Compatible
$10.99 - $12.99List Price: $26.99 Save up to $16.00 (59%)