The Hornady Superformance 7mm Rem Mag 139 gr SST 20 rounds box (Hornady part no. 80593) is 7mm Remington Magnum ammunition loaded with a 139-grain SST bullet. Hornady’s published figures from a 24-inch test barrel show 3,240 fps and 3,240 ft-lb at the muzzle, and 2,295 fps with 1,626 ft-lb at 500 yards. Superformance uses progressive propellants that Hornady says add 100 to 200 fps over conventional ammunition without extra chamber pressure, recoil or muzzle blast. The bullet is Hornady’s SST, loaded here at 139 grains in a Superformance round. It suits shooters who want the extra velocity of a Superformance load from a standard 20-round box for their 7mm Remington Magnum rifle.

Key Specifications

• Caliber is 7mm Remington Magnum, listed by Hornady as 7mm Rem Mag for this load.
• Bullet weight is 139 grains, the projectile mass Hornady lists for this item.
• Bullet type is SST, one of the Hornady bullets the Superformance line is loaded with.
• Muzzle velocity is 3,240 fps from a 24-inch test barrel, which is where the line’s added speed shows first.
• Muzzle energy is 3,240 ft-lb from that 24-inch test barrel, a measure of the load’s power at the muzzle.
• At 100 yards the load holds 3,033 fps, a downrange figure straight from Hornady’s table.
• Velocity at 200 yards is 2,837 fps, which shows how well the bullet holds speed at distance.
• Energy at 200 yards is 2,484 ft-lb, the figure to check when matching the load to your range.
• Propellant is a progressive Hornady Superformance powder, which the maker says gives 100 to 200 fps more than conventional ammunition.
• Quantity is 20 rounds per box, enough for a range session or a season’s worth of shots.

Frequently Asked Questions

Is Superformance ammunition safe in semi-autos and lever guns? Hornady states it is safe for use in all firearm types, including semi-autos, lever guns and pump actions, and that it stays within SAAMI pressure guidelines. It adds that some gas-operated systems work better with it than others.

What bullet does this 7mm Rem Mag load use? It uses a 139-grain SST bullet. Hornady loads its Superformance line with V-MAX, NTX, SST, CX and InterLock bullets, and this item is the SST version.

How fast is it? Hornady’s 24-inch test barrel data shows 3,240 fps and 3,240 ft-lb at the muzzle, 3,033 fps at 100 yards, 2,837 fps at 200 yards and 2,295 fps at 500 yards.

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