Superformance ammunition is 100 to 200 fps faster than any conventional ammunition on the market today, and achieves this performance in every gun, without increases in felt recoil, muzzle blast, temperature sensitivity, fouling or loss of accuracy. Superformance is a cutting edge technological advancement in ammunition design that transcends convention and achieves the highest performance of any ammunition on the market today. Superformance uses ultra progressive propellants that take your favorite SST or GMX bullets to levels of performance that are simply unattainable with conventional propellants. In order to get more velocity in the past, shooters have used a brute force approach with large charge weights of a slow burning powder in a larger cartridge case which leads to more recoil and muzzle blast. The Superformance solution utilizes specialized powders at normal charge weights, that impart all usable energy to the bullet reducing the rocket nozzle effect at the muzzle while still increasing velocity. Superformance provides increased performance, and is safe to use in all firearms, including semi-autos, lever gun and pump actions.
20 Round Box
Features and Specifications:
Manufacturer Number: 80576
Caliber: 7mm-08 Remington
Bullet Type: Gilding Metal Expanding
Bullet Weight: 139 Grains
Rounds: 20
Muzzle Energy: 2612 ft lbs
Muzzle Velocity: 2910 fps
20 Round Box
Features and Specifications:
Manufacturer Number: 80576
Caliber: 7mm-08 Remington
Bullet Type: Gilding Metal Expanding
Bullet Weight: 139 Grains
Rounds: 20
Muzzle Energy: 2612 ft lbs
Muzzle Velocity: 2910 fps
My Browning X-Bolt Stainl
My Browning X-Bolt Stainless Stalker loves it and shoots the GMX superformance in tighter groups than other cup and core bullets of equal cost. As for the other reviews, every rifle seems to like different ammo and this is what mine loves. 1 MOA all day... As for hunting, I only harvested one deer this season and it was 100yds lung broadside. Fell over without a blink. DEAD! Lungs all over the place behind it but hydroshock did the job since it didn't even flinch. Brain dead.
February 21, 2016
Fired 10 rounds of a 20 r
Fired 10 rounds of a 20 round box in a model 14 Savage, all primers show signs of very high pressure, 2 of which have holes punched all the way thru the face of the primer. Contacted Hornady, haven't received an answer yet. Accuracy was far below what I expected, 4 to 5 inches at 100 yds.
September 8, 2010
I'd been looking forward
I'd been looking forward to shooting this new Superformance ammo.I purchased 2 boxes of the GMX and 6 boxes of the SST all in 7mm-08. It didn't take long to realize that the product does not live up to the marketing hype. The test guns were Weatherby Vanguard Sub MOA,Savage Classic 14, Browning BAR ShortTrac. The SST case pressure is to high and the Weatherby bolt was jammed shut after each round due to extreme and I think dangerous case pressure. The BAR was the only gun case pressure was not an issue due to it's gas operation. The Weatherby and Savage are both sub moa guns with handloads and 3 different factory loads yet average groups with the superformance GMX and SST were 2.7 inches GMX and 3.2 inches for the SST. Recoil was about 10% greater than standard factory loads as well. In hindsight I should have guessed this would be the outcome of these loads, you can't change the laws of physics,higher pressure and velocity = less accuracy and greater recoil.
July 17, 2010