Hornady Superformance 7mm Rem Mag 139gr GMX Rifle Ammunition

Hornady Superformance 7mm Rem Mag 139gr GMX Rifle Ammunition delivers unmatched velocity, consistent accuracy, and powerful terminal performance—all in a lead-free, monolithic design. Loaded with the advanced GMX® (Gilding Metal eXpanding) bullet, this round is ideal for hunters seeking a hard-hitting, flat-shooting solution that performs flawlessly across a wide range of temperatures and conditions. Backed by Hornady’s Superformance® technology, this ammunition boosts velocity by up to 200 fps without added chamber pressure or recoil, maximizing downrange energy and accuracy for long-range, ethical hunting.

Product Features

• Lead-Free GMX® Bullet Design
  Constructed of 95% copper alloy, the GMX® bullet offers deep penetration, high weight retention (up to 95%), and devastating expansion while meeting lead-free hunting regulations.

• Superformance® Propellant Technology
  Achieves higher velocity—up to 200 fps faster than standard loads—without increasing pressure, recoil, or fouling. Delivers flatter trajectories and greater energy at distance.

• Monolithic Construction for Controlled Expansion
  The polymer tip initiates expansion upon impact, while the grooved shank reduces barrel fouling and enhances accuracy for repeated shots.

• Optimized for Magnum Hunting Platforms
  Specifically engineered for use in 7mm Remington Magnum rifles, providing long-range capability, deep penetration, and consistent terminal ballistics on medium-to-large game.

• Reloadable Precision Brass Cases
  Premium Hornady brass and non-corrosive Boxer primers ensure smooth feeding, reliable ignition, and the option to reload for extended shooting value.

Specifications

Caliber: 7mm Remington Magnum
Bullet Weight: 139 grains
Bullet Type: GMX® (Gilding Metal eXpanding), Polymer Tip
Muzzle Velocity: Approx. 3,220 fps
Muzzle Energy: Approx. 3,194 ft-lbs
Casing: Brass (Reloadable)
Primer: Boxer, Non-Corrosive
Rounds per Box: 20
Part Number: 80636
UPC: 090255806368
Country of Origin: USA

Product Dimensions (Shipping)

Box Dimensions: 6.25" L x 3.5" W x 1.25" H
Weight: Approx. 1.25 lbs

Key Benefits

• Increased velocity and energy for extended-range shooting

• Flat trajectory for precise targeting in varied terrain

• Lead-free construction for eco-conscious and regulation-compliant hunting

• Retains nearly 100% of weight for deep, straight-line penetration

• Reliable performance across a wide range of temperatures and climates

Usage Instructions

Use only in rifles chambered for 7mm Remington Magnum. Inspect ammunition before use. Store in a cool, dry environment. Always follow safe handling practices and firearm safety guidelines.

Warranty Information

Hornady offers a limited warranty against defects in materials and workmanship. For support or product inquiries, contact Hornady customer service directly.

For hunters who demand speed, precision, and ethical terminal performance, Hornady Superformance 7mm Rem Mag 139gr GMX Ammunition delivers cutting-edge ballistic innovation in a high-performance, lead-free package.

Ammunition Shipping Disclaimer:

Federal law mandates that you must be at least 18 years old to purchase rifles, shotguns, and their respective ammunition, and at least 21 years old to purchase all other firearms and ammunition. Ammunition will be shipped via ground service by the carrier of our choice to the contiguous 48 states only.  A street address is required for delivery. There is no option for shipping ammunition to international customers. 

For safety reasons, we do not accept returns on ammunition with no exception. Always make sure you are using the correct ammunition for your firearm.

DNW Outdoors customers in LA, DC, MN, PA, NY, NJ, MA, IL, CT, and CA should check with their local laws for ammunition restrictions before placing an order.

Due to New York State Law requiring a NICS background check at the time of ammunition purchase DNW Outdoors will not be able to sell and ship ammunition to the State of New York. 

Residents of Illinois purchasing ammunition must provide proof of a FOID card via email  at onlinesales1@dnwoutdoors.com with the subject line FOID before ammunition purchased will be shipped.

Residents of New Jersey purchasing ammunition must provide proof of  a FPIC card or New Jersey Handgun permit via email to onlinesales1@dnwoutdoors.com with the subject line of “FPIC” before  the ammunition purchased will be shipped.

Residents of Connecticut purchasing ammunition must provide proof of a Ammunition Eligibility Certificate or Permit to via email to onlinesales1@dnwoutdoors.com with the subject line of “Ammunition Eligibility Certificate”

DNW Outdoors reserves the right to ask for proof of age when buying age restricted items such as ammunition and firearms. No Exceptions.

**WARNING:** This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov